By 1900, as a result of the Dawes Act and the Curtis Act, approximately one-half of land previously owned by Indian tribes was owned by whites.
In 1901, the Wichita Mountains Wildlife Refuge, the oldest and largest of nine National Wildlife Refuges in the state, was founded.
After petitioning congress to hand over jurisdiction, the 57 acres was given to Arkansas in 1905.
In 1905, the Sequoyah Statehood Convention laid the groundwork for the Oklahoma Statehood Convention, which took place two years later.
On June 16, 1906, Congress enacted a statute authorizing the people of the Oklahoma and Indian Territories (as well what would become the states of Arizona and New Mexico) to form a constitution and state government in order to be admitted as a state.
On November 16, 1907, President Theodore Roosevelt issued Presidential Proclamation no. 780, establishing Oklahoma as the 46th state in the Union.
In 1907, upon gaining statehood, Oklahoma acquired the territory of the Oklahoma panhandle.
On November 11, 1911, the temperature in Oklahoma City reached a high of 83 °F (28 °C) and then dropped to a low of 17 °F (−8 °C) by midnight due to a cold front.
In 1912, Oklahoma experienced a tornado outbreak with an average of about one tornado per hour.
After 1915, social tensions were exacerbated by the revival of the Ku Klux Klan.
In late September 1918, the first cases of the Spanish flu appeared in Oklahoma, overwhelming health workers and local governing bodies.
By 1919, the Spanish flu pandemic ebbed in Oklahoma, after an estimated 100,000 people fell ill, and around 7,500 proved fatal.
During the first half-century of statehood, Oklahoma was carried by the Republican Party in the 1920 presidential election.
In 1920, the U.S. census population of Oklahoma was 2,028,283.
In 1921, the Tulsa race massacre broke out, with White mobs attacking Black people and carrying out a pogrom in Greenwood.
In 1927, Oklahoman businessman Cyrus Avery began the campaign to create U.S. Route 66, using a stretch of highway from Amarillo, Texas to Tulsa, Oklahoma as part of the original highway and also spearheading the creation of the U.S. Highway 66 Association to oversee the planning of Route 66, based in his hometown of Tulsa.
During the first half-century of statehood, Oklahoma was carried by the Republican Party in the 1928 presidential election.
In 1934, Oklahoma experienced a summer of severe drought with weeks of virtual rainlessness and highs well over 100 °F (38 °C).
In 1939, John Steinbeck's novel "The Grapes of Wrath" was published, popularizing the negative cultural stereotype of "Okies".
In 1940, Oklahoma's population was predominantly non-Hispanic White, comprising 90.1% of the state's residents.
After the 1948 election, Oklahoma turned firmly Republican.
Broadcast television in Oklahoma began in 1949 with the launch of KFOR-TV (then WKY-TV) in Oklahoma City and KOTV-TV in Tulsa.
Over a twenty-year period ending in 1950, the state saw its only historical decline in population, dropping 6.9 percent as impoverished families migrated out of the state after the Dust Bowl.
Since 1952, Oklahoma has been carried by Republican presidential candidates in all but one election.
In 1953, Ridge Bond and the cast of Oklahoma! were featured on a CBS Omnibus television broadcast.
In 1954, Oklahoma experienced a summer of severe drought with weeks of virtual rainlessness and highs well over 100 °F (38 °C).
In 1962, ballerina Yvonne Chouteau and her husband Miguel Terekhov founded the University of Oklahoma's dance program, which was the first fully accredited program of its kind in the United States.
Oklahoma was carried by Lyndon B. Johnson in his 1964 landslide victory.
In 1973, the Public Service Company of Oklahoma proposed the Black Fox Nuclear Power Plant near Inola, Oklahoma.
Oklahoma has had capital punishment as a legal sentence since 1976.
The Medieval Fair of Norman has been held annually since 1976, which was Oklahoma's first medieval fair.
In 1979, protestors disrupted construction of the Black Fox Nuclear Power Plant, several months after the Three Mile Island accident.
During the 1980s, a collapse in Oklahoma's energy industry led to the loss of nearly 90,000 energy-related jobs.
From 1980 to 2014, male life expectancy in Oklahoma increased by 4.0 years, while the national average increased by 6.7 years. Female life expectancy in Oklahoma increased by 1.0 years, while the national average increased by 4.0 years during the same period.
In 1980, Oklahoma experienced a summer of severe drought with weeks of virtual rainlessness and highs well over 100 °F (38 °C).
In 1980, TBN, a Christian television network, built its first entirely TBN-owned affiliate in Oklahoma City.
In 1982, the Black Fox Nuclear Power Plant project was cancelled after nine years of legal challenges.
In 1985 the US Supreme Court Case Oklahoma v. Arkansas decided the land would remain Arkansas, even though the Choctaw had not been notified or asked about the territory being handed over.
The Oklahoma City Pride Parade has been held annually in late June since 1987 in the gay district of Oklahoma City on 39th and Penn.
In 1990, 95% of Oklahomans spoke only English at home.
In 1990, the White population of Oklahoma was 81%.
The growth of total education expenditures between 1992 and 2002 ranked 22nd.
On April 19, 1995, Oklahoma City was the site of the Oklahoma City bombing, in which Timothy McVeigh detonated a large, crude explosive device outside the Alfred P. Murrah Federal Building, killing 168 people, including 19 children.
Between 2000 and 2010, the leading cities in population growth were Blanchard (172.4%), Elgin (78.2%), Jenks (77.0%), Piedmont (56.7%), Bixby (56.6%), and Owasso (56.3%).
By 2000, nearly 90,000 energy-related jobs were lost in Oklahoma due to the energy industry collapse that started during the 1980s.
Following the 2000 census, the Oklahoma delegation to the U.S. House of Representatives was reduced from six to five representatives.
In 2000, 92.6% of Oklahomans spoke only English at home, while 7.4% spoke another language.
In 2000, Oklahoma had approximately 5,000 Jews and 6,000 Muslims, with ten congregations for each group.
In 2000, Oklahoma ranked 45th in physicians per capita but was slightly above the national average in hospital beds per 100,000 people.
In 2000, Spanish was the second-most commonly spoken language in Oklahoma, with 141,060 speakers.
On June 11, 2001, Timothy McVeigh was executed by the federal government for his crime in the Oklahoma City bombing.
In 2001, Southern Hills Country Club in Tulsa hosted one of its three U.S. Open tournaments.
The growth of total education expenditures between 1992 and 2002 ranked 22nd.
In 2003, Oklahoma Gas & Electric (OG&E) was the first electric company in Oklahoma to generate electricity from wind farms.
In 2003, the Medieval Fair of Norman moved to Reaves Park due to its increasing size.
Data from 2004 was used to determine Oklahomans' rank in generosity for the 2006 Catalogue of Philanthropy.
Every single county in Oklahoma has been won by the Republican candidate in each election since 2004.
In 2004, Oklahoma was rated first in the United States for pre-kindergarten education.
In 2005, Oklahoma was the 21st-largest recipient of medical funding from the federal government, with health-related federal expenditures in the state totaling $75,801,364. Immunizations, bioterrorism preparedness, and health education were the top three most funded medical items.
In 2005, international exports from Oklahoma's manufacturing industry totaled $4.3 billion, accounting for 3.6 percent of its economic impact.
In 2005, nearly 25 percent of Oklahomans between the ages of 18 and 64 did not have health insurance, the fifth-highest rate in the nation.
In 2005, the Cherokee Nation initiated a ten-year plan focused on growing new speakers of the Cherokee language, with the goal of having 80% of the population fluent in fifty years. The Cherokee Preservation Foundation invested $3 million in this effort.
In 2005, the ancestral makeup of Oklahoma included German (14.5%), American (13.1%), Irish (11.8%), English (9.6%), African American (8.1%), and Native American (11.4%, including 7.9% Cherokee).
In 2011, data from 2005 to 2009 indicated about 5% of Oklahoma's residents were born outside the United States.
In 2006, Tulsa's Oktoberfest was named one of the top 10 in the world by USA Today.
In 2006, there were more than 220 newspapers in Oklahoma, including 177 weekly and 48 daily publications.
The 2006 Catalogue for Philanthropy (with data from 2004) ranked Oklahomans 7th in the nation for overall generosity.
July 1, 2007 marked the beginning of the completions component for degree holders in Oklahoma, which ran until June 30, 2008.
November 16, 2007, marked the 100th anniversary of Oklahoma's statehood, celebrated with multiple events. The American Bus Association named Oklahoma's centennial celebration the top event in the United States for 2007.
Between 2007 and 2008, Oklahoma's high school dropout rate decreased from 3.1 to 2.5 percent.
In 2007, Oklahoma was rated one of the most business-friendly states in the nation, with the 7th-lowest tax burden.
In 2007, Tulsa's Mayfest festival entertained more than 375,000 people in four days.
In 2007, oil accounted for $35 billion in Oklahoma's economy.
In 2007, six of Oklahoma's universities were recognized in the Princeton Review's list of the best 122 regional colleges, and three of those made the list of top colleges for best value.
In early 2007, lawmakers began seeking funding to connect the Heartland Flyer to Tulsa, but nothing came of it.
Oklahoma ranked last among the 50 states in a 2007 study by the Commonwealth Fund on health care performance.
June 30, 2008 marked the end of the completions component for degree holders in Oklahoma, which began on July 1, 2007.
According to the Pew Research Center in 2008, around 80% of Oklahoma's religious adherents were Christian.
As of 2008, Oklahoma had 638,817 students enrolled in public schools and spent $7,755 per student.
Between 2007 and 2008, Oklahoma's high school dropout rate decreased from 3.1 to 2.5 percent.
In 2008, Interstate 44 in Oklahoma City was Oklahoma's busiest highway, with a daily traffic volume of 123,300 cars.
Oklahoma was the only state where Barack Obama failed to carry any counties in the 2008 election.
In 2009, Oklahoma ranked 13th for total energy consumption per capita, and its energy costs were eighth-lowest in the nation.
In 2009, Oklahoma was at the bottom of states in usage of renewable energy, with 94% of its electricity being generated by non-renewable sources.
In 2009, Oklahoma's "Failure to Protect" law went into effect, leading to the imprisonment of 139 women solely for failure-to-protect charges.
In 2009, the oil energy industry contributed $35 billion to Oklahoma's gross domestic product (GDP).
In 2011, data from 2005 to 2009 indicated about 5% of Oklahoma's residents were born outside the United States.
In the 2009–10 school year, Oklahoma had the highest enrollment of Native American students in the nation with 126,078 students.
At the 2010 census, Oklahoma's population was 3,751,675.
Between 2010 and 2014, 125,989 Oklahomans having lived with at least one undocumented family member.
From 2010 the Tulsa Shock of the Women's National Basketball Association (WNBA) played in Oklahoma
In 2010, Love's Travel Stops & Country Stores ranked 18th, QuikTrip ranked 37th, and Hobby Lobby ranked 198th on the Forbes list of largest private companies.
In 2010, Oklahoma had 598 incorporated places, including four cities over 100,000 in population and 43 over 10,000.
In 2010, Oklahoma had the nation's third-highest number of bridges classified as structurally deficient, with nearly 5,212 bridges in disrepair.
In 2010, Oklahoma's football program ranked 12th in attendance among American colleges, with an average of 84,738 people attending its home games.
In 2010, Oklahoma's largest cities in descending order of population were: Oklahoma City (579,999), Tulsa (391,906), Norman (110,925), Broken Arrow (98,850), Lawton (96,867), Edmond (81,405), Moore (55,081), Midwest City (54,371), Enid (49,379), and Stillwater (45,688).
In 2010, Will Rogers World Airport in Oklahoma City averaged a yearly passenger count of more than 3.5 million, and Tulsa International Airport served more than 1.3 million boardings.
In 2010, the center of population of Oklahoma was in Lincoln County near the town of Sparks.
In 2010, the largest church memberships in Oklahoma were in the Southern Baptist Convention, the United Methodist Church, the Roman Catholic Church, the Assemblies of God, and the Church of Jesus Christ of Latter-day Saints (LDS Church).
Since 2010, the English language has been official in the state of Oklahoma.
Between 1976 and mid-2011, Oklahoma had the highest per capita execution rate in the nation.
In 2011, 47.3% of Oklahoma's population younger than age 1 were minorities, meaning they had at least one parent who was not non-Hispanic white.
In 2011, Oklahoma experienced a summer of severe drought with weeks of virtual rainlessness and highs well over 100 °F (38 °C).
In 2011, Oklahoma was ranked eighth for installed wind energy capacity.
In 2011, data from 2005 to 2009 indicated about 5% of Oklahoma's residents were born outside the United States.
In mid-2011, Oklahoma had a civilian labor force of 1.7 million, with non-farm employment around 1.5 million. The government sector provided the most jobs.
In 2012, Oklahoma had 85,500 farms producing $4.3 billion in animal products and fewer than one billion dollars in crop output.
In 2012, the House passed HCR 1024, which would change the state motto from "Labor Omnia Vincit" to "Oklahoma—In God We Trust!"
Oklahoma had an all-Republican congressional delegation from 2013 to 2019.
According to the Pew Research Center in 2014, 79% of Oklahoma's religious adherents were Christian. The largest growth since 2008 was in the number of people who identify as religiously unaffiliated.
Between 2010 and 2014, 125,989 Oklahomans having lived with at least one undocumented family member.
In 2014, the Oklahoma City Blue of the NBA G League relocated to Oklahoma City from Tulsa, where they were formerly known as the Tulsa 66ers.
In 2014, the average life expectancy for males in Oklahoma was 73.7 years, while the national average was 76.7 years. For females in Oklahoma, the average was 78.5 years, compared to the national average of 81.5 years.
Although registered Republicans were a minority in the state until 2015, Oklahoma has been carried by Republican presidential candidates in all but one election since 1952.
In 2015, the Tulsa Shock of the Women's National Basketball Association relocated to Dallas–Fort Worth, becoming the Dallas Wings.
On May 31, 2016, several cities in Oklahoma experienced record setting flooding.
According to the National Education Association, teachers in Oklahoma had ranked 49th out of the 50 states in terms of teacher pay in 2016.
Oklahoma City was the largest city in the United States carried by Republican Donald Trump in the 2016 election.
On April 2, 2018, tens of thousands of K–12 public school teachers in Oklahoma began a strike due to a lack of funding for education, despite a recent legislative measure to raise teacher salaries by $6,100, teachers sought a $10,000 raise and more funding for education.
On June 26, 2018, Oklahoma legalized marijuana for medical purposes, becoming one of the most conservative states to approve medical marijuana.
According to a study in 2018, approximately 236,882 immigrants resided in Oklahoma, making up 6% of the state's population.
In 2018, Oklahoma had an incarceration rate of 1,079 per 100,000 residents, higher than any country in the world, earning it the description of "the world's prison capital".
In 2019, 53.5% of Oklahoma's electricity was produced from natural gas and 34.6% from wind power.
In 2019, a survey found that the pay raise obtained by the strike lifted the State's teacher pay ranking to 34th in the nation.
Oklahoma had an all-Republican congressional delegation until 2019.
In May 2020, Oklahoma became the first state to enact an anti-red flag law, prohibiting the acceptance of any grants or funding to enact red flag laws.
On July 9, 2020, the Supreme Court of the United States determined in McGirt v. Oklahoma that the reservations of the Five Tribes, comprising much of Eastern Oklahoma, were never disestablished by Congress and thus are still "Indian Country" for the purposes of criminal law.
As of September 2020, Oklahoma's unemployment rate was 5.3%.
According to the 2020 Public Religion Research Institute's survey, 73% of Oklahoma's population were Christian, with Evangelicalism making up 29%. About 22% of the population had no religious affiliation.
As of the 2020 election, Native American voters, 16% of the state's population, are split, with urban populations supporting the Democrats and rural reservation populaces favoring the Republicans.
In 2020, ESPN called Oklahoma City "the center of the softball universe", referring to the fast-pitch version of the sport.
In 2020, Oklahoma City had the largest metropolitan area in the state, with 1,425,695 people.
In 2020, according to the U.S. census, 14.2 percent of Oklahomans identify as American Indians, which is the highest indigenous population by percentage in any state.
Oklahoma City was the largest city in the United States carried by Republican Donald Trump in the 2020 election.
Oklahoma was impacted by the Covid pandemic beginning in 2020.
The 2020 census revealed Oklahoma's population to be 3,959,353, an 5.5% increase since 2010.
As of March 2021, Oklahoma had no operational nuclear power plants.
Oklahoma has had an all-Republican congressional delegation since 2021.
As of December 22, 2022, Oklahoma had been more impacted by the Covid pandemic than the average U.S. state, with 405 deaths per 100,000 population and 59 percent fully vaccinated, compared to the U.S. averages of 331 deaths per 100,000 and 68 percent fully vaccinated.
A 2022 American Community Survey estimate found that Oklahoma's population had surpassed 4 million residents for the first time.
According to HUD's 2022 Annual Homeless Assessment Report, there were an estimated 3,754 homeless people in Oklahoma.
In 2022, Southern Hills Country Club in Tulsa hosted one of its five PGA Championships.
In April 2023, a report by The Sentencing Project highlighted Oklahoma's Failure to Protect law, which has been used primarily against women, sometimes resulting in survivors of abuse facing longer sentences.
In June 2023, Oklahoma and Kansas state officials began seeking federal approval and funding to extend the Heartland Flyer from Oklahoma City to Newton, Kansas.
In November 2023, KDOT said the Heartland Flyer service extension would start in 2029 if approved, but could begin sooner if fast-tracked.
In 2023, Oklahoma's gross domestic product was $254.13 billion, and its per capita income was $58,499, which ranked 43rd in the U.S.
Oklahoma was impacted by the Covid pandemic until 2023.
As of 2024, Oklahoma had more than 4,700 dams, about 20% of all dams in the U.S.
From June 14–16, 2024, a teqball competition was held in Tulsa.
In April 2025, the Oklahoma Legislature passed a non-binding concurrent resolution proclaiming Christ the King and recognize "the enduring influence of Christian faith in the lives of its people."
In 2028, Devon Park in Oklahoma City will host softball at the Summer Olympics, and the Riversport OKC complex will host canoe slalom.
KDOT projected the Heartland Flyer service extension would start in 2029 if approved, or possibly sooner if fast-tracked.
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