After the Easter Rising of 1916 in Dublin and a bitter war of independence from 1919 to 1921, the British government negotiated the Anglo-Irish Treaty of 1921. It partitioned the island of Ireland: 26 counties in the south and west became the Irish Free State (since 1949 the Republic of Ireland), while six counties in the north-east, with a Protestant unionist majority, remained part of the United Kingdom as Northern Ireland.
Further reading: an editorial guide on this topic opens in a new window for additional context.
The Stormont Parliament was set up to give Northern Ireland a measure of self-government. The Irish Free State left the Commonwealth in 1949 and became a republic; Northern Ireland remains part of the UK. The partition still shapes politics on both sides of the border.
You may be asked the year of partition (1921), the name of the new state in the south (Irish Free State), or how many Irish counties stayed in the UK (six).
Test yourself on this topic
These questions from the official-format question bank cover the same material. Tap any question to see the correct answer and a short explanation.
Keep going
- Read the full study notes for British History.
- Try a practice test on this chapter.
- Sit a full 24-question timed mock.
- Browse the complete library of topic explainers.
Related topic explainers
Tudor Explorers: Drake and Raleigh
Sir Francis Drake circumnavigates the globe and Sir Walter Raleigh founds an English colony in America.
The Thatcher Years (1979–1990)
Britain's first female Prime Minister, the Falklands War, privatisation and the miners' strike.
Oliver Cromwell and the Republic
The country gentleman who became Lord Protector and ruled the Commonwealth of England.
The Jacobite Rebellions
Bonnie Prince Charlie, the battle of Culloden in 1746, and the end of clan Scotland.