The Irish Free State was established following the Anglo-Irish Treaty of 1921, which ended the Irish War of Independence (1919-1921). The treaty divided Ireland into two political entities: Northern Ireland, which remained part of the United Kingdom, and the Irish Free State, which comprised the majority of the island.
The Irish Free State had its own parliament, government, and legal system. However, it was still subject to certain restrictions and obligations as a dominion within the British Empire, including the continued presence of the British monarch as head of state and the need for British approval for certain constitutional changes.
The Irish Free State was a significant milestone in Irish history as it marked the establishment of an independent Irish state for the first time in centuries. However, it was also a time of political and social upheaval, as many Irish citizens desired complete independence rather than dominion status within the British Empire.
In 1937, the Constitution of Ireland was adopted, which established a republic known as "Ireland" (or Éire in Irish) and severed the remaining constitutional ties with the United Kingdom. The Irish Free State officially ceased to exist, and the country became a fully sovereign and independent state.