Ireland is an island in Northwestern Europe, divided between the Republic of Ireland (a sovereign state) and Northern Ireland (part of the UK). It is the second-largest island of the British Isles and the third-largest in Europe. The island's total population is just over 7 million, with the Republic of Ireland holding 5.1 million and Northern Ireland having 1.9 million, making it the second-most populous island in Europe after Great Britain.
By 1900, cultural nationalists had begun the Gaelic revival, which saw the beginnings of modern literature in Irish.
Sir Joseph Larmor's influential work, Aether and Matter, a book on theoretical physics was published in 1900.
In 1904, the Republic of Ireland's national theatre, the Abbey Theatre, was founded.
In 1913, the Ulster Volunteers were formed under the leadership of Edward Carson to prevent the Home Rule bill from passing.
In 1914, after several attempts to pass a Home Rule bill through parliament, it looked certain that one would finally pass.
In 1914, the Irish Volunteers were established to ensure that the Home Rule Bill was passed.
In 1916, the Easter Rising was carried out by the Irish Volunteers together with the Irish Citizen Army.
In 1918, support for Irish republicanism increased further due to the ongoing war in Europe, as well as the Conscription Crisis.
In 1918, the pro-independence republican party, Sinn Féin, received overwhelming endorsement in the general election.
In 1919, Sinn Féin proclaimed an Irish Republic, setting up its own parliament (Dáil Éireann) and government.
In 1920, Northern Ireland resulted from the division of the United Kingdom by the Government of Ireland Act 1920.
In July 1921, a three-year guerrilla war launched by the Irish Republican Army (IRA) ended in a truce.
In December 1921, the Anglo-Irish Treaty was concluded between the British government and representatives of the Second Dáil.
By 1921, the population of Ireland had been reduced to slightly over four million, a significant drop from over eight million in 1841.
In 1921, Dublin-based clubs formed the Football Association of the Irish Free State after a dispute with the IFA over the location of an Irish Cup semi-final replay.
Prior to the partition in 1921, Ireland had a long history as an economic colony.
In June 1922, violence continued mostly in Northern Ireland.
James Joyce's 1922 novel Ulysses is considered one of the most important works of Modernist literature.
In May 1923, the Irish Civil War officially ended when de Valera issued a cease-fire order.
In 1926, the FAI organised its first international fixture against Italy.
In 1928, the national Irish-language theatre, An Taibhdhearc, was established in Galway.
In 1929 the government of Northern Ireland was controlled by the Ulster Unionist Party.
In 1937, a new constitution was adopted, completing a process of gradual separation from the British Empire.
In September 1941, German intelligence operations in Ireland ended when police made arrests based on surveillance.
In 1941, Belfast suffered four bombing raids during the Second World War.
In 1947, Fred Daly won the British Open at Carnoustie, being the first Irishman to win the British Open.
In 1948, the Irish Free State declared itself a republic with the Republic of Ireland Act of 1948.
In 1949, the state was declared, officially, to be the Republic of Ireland.
Máirtín Ó Cadhain's 1949 novel Cré na Cille is regarded as a modernist masterpiece.
In 1951, Ernest Walton won the Nobel Prize in Physics.
In 1953, FIFA directed that the FAI's team be known as the "Republic of Ireland" and the IFA's team be known as "Northern Ireland".
In 1953, an Irish government survey, found that 50% of whiskey drinkers in the United States had never heard of Irish whiskey.
In 1958, Northern Ireland qualified for the World Cup finals, reaching the quarter-finals.
In 1961, the population continued to fall in Ireland after the Great Famine.
In 1967, the astronomer Jocelyn Bell Burnell, from Lurgan, County Armagh, discovered pulsars.
In 1969, the paramilitary Provisional IRA emerged from a split in the Irish Republican Army and began a campaign against what it called the "British occupation of the six counties".
In 1970, first European to win the U.S. Open.
In 1972, owing to the civil unrest during the Troubles, the British government suspended home rule and imposed direct rule.
Until 1972, Northern Ireland was a self-governing jurisdiction within the United Kingdom with its own parliament and prime minister.
In 1973, The Republic of Ireland and the United Kingdom both acceded to the European Economic Community (EEC).
In 1973, both the Republic of Ireland and the United Kingdom, including Northern Ireland, joined the European Economic Community.
In 1973, there was an unsuccessful attempt to end the Troubles politically, known as the Sunningdale Agreement.
In 1982, Northern Ireland qualified for the World Cup finals.
In 1986, Northern Ireland qualified for the World Cup finals.
Beginning in 1987, the Irish economy improved, setting the stage for the Celtic Tiger.
In 1988, the Republic of Ireland qualified for the European Championship.
In 1990, the Republic of Ireland qualified for the World Cup finals, reaching the quarter-finals.
In 1991, Ireland hosted games during the Rugby World Cup, including a quarter-final.
In 1994, Irish rugby became professional.
In 1994, the Republic of Ireland qualified for the World Cup finals.
In 1994, violence had decreased greatly after the Provisional IRA and loyalist ceasefires.
Between 1995 and 1999, the Republic's real GDP grew by an average of 9.6% per annum.
From 1995 onwards, Ireland experienced a period of rapid economic expansion that became known as the Celtic Tiger period.
In 1995, Sonia O'Sullivan won gold at the World Championships.
Ireland was affected by a heat wave in 1995.
In 1998, following a ceasefire by the Provisional IRA and multi-party talks, the Good Friday Agreement was concluded as a treaty between the British and Irish governments, annexing the text agreed in the multi-party talks.
In 1999, John B. Cosgrave was a specialist in number theory.
In 1999, Ulster won the Heineken Cup.
In 1999, economically significant finds of natural gas were made in the Corrib Gas Field off the County Mayo coast.
In 1999, the Republic of Ireland joined the euro.
In 2000, John B. Cosgrave discovered a 2000-digit prime number.
In 2000, Sonia O'Sullivan won silver at the Sydney Olympics.
In 2000, the Helvick oil field was discovered, estimated to contain over 28 million barrels of oil.
In 2000, the Republic of Ireland was the sixth-richest country in the world in terms of GDP per capita.
Since the 2001 Local Government Act, Kilkenny is no longer a city for administrative purposes but is entitled by law to continue to use the description.
In 2002, the Republic of Ireland qualified for the World Cup finals.
In 2003, Gaelic football represented 34% of total sports attendances at events in Ireland and abroad, followed by hurling at 23%, soccer at 16% and rugby at 8%.
In 2003, Gillian O'Sullivan won silver in the 20k walk at the World Championships.
In 2003, John B. Cosgrave discovered a record composite Fermat number.
Ireland was affected by a heat wave in 2003.
In 2004, the Irish International side had success in the Six Nations Championship, including Triple Crowns
Since 2004, research and development in renewable energy (such as wind power) has increased.
Since the European Union expanded to include Poland in 2004, Polish people have comprised the largest number of immigrants (over 150,000) from Central Europe.
In 2005, the Provisional IRA announced the end of its armed campaign and an independent commission supervised its disarmament and that of other nationalist and unionist paramilitary organisations.
Since 2005, Katie Taylor has won gold in every European and World championship.
As of 2006, 4.3 million Canadians, or 14% of the population, were of Irish descent.
As of 2006, there were 420,000 foreign nationals in the Republic of Ireland, about 10% of the population.
In 2006, County Leitrim was the final Irish county to record a population increase post-famine.
In 2006, Derval O'Rourke won gold at the World Indoor Championship in Moscow.
In 2006, Munster won the Heineken Cup.
In 2006, The Ryder Cup was held at The K Club in County Kildare.
In 2006, salmon fishing in Ireland received a boost with the closing of the salmon driftnet fishery.
Ireland was affected by a heat wave in 2006.
In July 2007, Pádraig Harrington became the first Irishman since Fred Daly in 1947 to win the British Open at Carnoustie.
In 2007, Croke Park hosted international rugby and soccer games during the Lansdowne Road stadium redevelopment.
In 2007, the Assembly and power-sharing Executive were restored again, and the British government officially ended its military support of the police in Northern Ireland (Operation Banner) and began withdrawing troops.
In 2007, the Irish International side had success in the Six Nations Championship, including Triple Crowns
In July 2008, Pádraig Harrington successfully defended his British Open title.
In 2008, Ireland's Celtic Tiger period came to an end with an unprecedented financial crisis.
In 2008, Kenneth Egan won a silver medal in boxing at the Beijing Olympic Games, and Paddy Barnes secured a bronze medal.
In 2008, Munster won the Heineken Cup.
In 2008, the financial crisis began, dramatically ending the period of boom in Ireland. GDP fell by 3%.
In 2009, CNBC researched and reported that Irish whiskey remains popular domestically and has grown in international sales.
In 2009, GDP fell by 7.1%, the worst year since records began in Ireland.
In 2009, Ireland experienced an economic depression.
In 2009, Leinster won the Heineken Cup, and the Irish International side won a Grand Slam in the Six Nations Championship.
In 2009, Olive Loughnane won a silver medal in the 20k walk at the World Athletics Championships in Berlin.
In 2009, nearly a quarter of births (24 percent) in the Republic of Ireland were to mothers born outside of Ireland.
In 2010, Graeme McDowell became the first Irish golfer to win the U.S. Open, and the first European to win that tournament since 1970.
In 2010, Paddy Barnes secured gold in the European Amateur Boxing Championships and Commonwealth Games.
In 2010, the Lansdowne Road stadium redevelopment was completed and international rugby and soccer games no longer needed to be played at Croke Park.
In a 2010 survey conducted on behalf of the Irish Times, 32% of respondents said they went to a religious service more than once per week.
Ireland experienced unusually cold weather during the winter of 2010-11, with temperatures falling as low as -17.2°C in County Mayo on 20 December.
Since just before the year 2010, Bundoran has hosted European championship surfing.
In 2011, Leinster won the Heineken Cup.
In 2011, Rory McIlroy won the U.S. Open and Darren Clarke won the Open Championship at Royal St. George's.
The Muslim community is growing in Ireland, mostly through increased immigration, with a 50% increase in the republic between the 2006 and 2011 census.
On 27 June 2012, Northern Ireland's deputy first minister and former IRA commander, Martin McGuinness, shook hands with Queen Elizabeth II in Belfast, symbolising reconciliation between the two sides.
In August 2012, Katie Taylor became the first Irish woman to win a gold medal in boxing at the Olympic Games in London.
In August 2012, Rory McIlroy won his 2nd major championship by winning the USPGA Championship by a record margin of 8 shots.
In 2012, Leinster won the Heineken Cup.
In 2012, research showed that the occurrence of genetic markers for the earliest farmers was almost eliminated by Beaker-culture immigrants.
In 2012, the Republic of Ireland qualified for the European Championship.
In 2012, unemployment in Ireland remained above 14%.
As of 2013, there were 40 million Irish-Americans and 33 million Americans who claimed Irish ancestry.
Ireland was affected by a heat wave in 2013.
In 2014, the Republic of Ireland ranked as one of the top 10 markets for clean-technology investment in the Global Green Economy Index.
In 2015, the Republic of Ireland was ranked the sixth most developed nation in the world by the United Nations' Human Development Index.
Following a referendum vote in 2016, the United Kingdom, Northern Ireland included, voted to leave the European Union (EU).
In 2016, Northern Ireland qualified for the European Championship.
In 2016, a referendum on EU membership was held in the UK, resulting in a vote to leave the bloc.
In 2018, the Irish International side won a Grand Slam in the Six Nations Championship.
Ireland was affected by a heat wave in 2018.
In 2020 the United Kingdom, Northern Ireland included, left the European Union (EU).
In 2020, the UK officially left the European Union following a referendum held in 2016.
In 2021, the GDP of the Republic of Ireland was €423.5 billion (nominal), with a per capita of €84,049.9 (nominal). In Northern Ireland in 2021, the GDP was £52 billion (GVA Balanced), with a per capita of £27,154 (GVA Balanced).
Since 2021, the earliest evidence of human activity in Ireland is dated to 33,000 years ago.
In 2022, the population of the entire island of Ireland was just over 7 million, with 5.1 million in the Republic of Ireland and 1.9 million in Northern Ireland.
In 2023, monthly cost of living and average wage after tax were compared between Northern Ireland and the Republic of Ireland.
According to the 2024 Global Peace Index, Ireland is the second most peaceful country in the world.
Ireland was ranked 19th in the Global Innovation Index in 2024.
In 2025, Ireland is ranked 10th in the ICC Men's Test Team Rankings with a rating of 30.