Partition of Ireland
The partition of Ireland () divided the island of Ireland into two distinct jurisdictions, Northern Ireland and Southern Ireland. It took place on 3 May 1921 under the Government of Ireland Act 1920. Today the former is still known as Northern Ireland and forms part of the United Kingdom, while the latter is now a sovereign state also named Ireland and sometimes called the Republic of Ireland.
Civil Authorities (Special Powers) Act (Northern Ireland) 1922
Partition was formally established with the Government of Ireland Act 1920. This also established the Parliament of Northern Ireland, which came into being the following year. Partition was followed by high levels of inter-communal violence, especially in Belfast. The Irish Republican Army, although it spent most of these years fighting in the Irish Civil War, aimed to use armed force to end partition and compel the United Kingdom to withdraw sovereignty from Northern Ireland.