Partition of Ireland
Beginning on 21 January 1919 with the Soloheadbeg ambush, through the Irish War of Independence, Irish republicans attempted to bring about the secession of Ireland from the United Kingdom of Great Britain and Ireland. Meanwhile, Irish unionistsmost of whom lived in the northeast of the islandwere just as determined to maintain the Union. The British Government, committed to implementing Home Rule, set up a cabinet committee under the chairmanship of southern unionist Walter Long. The Long Committee recommended the establishment of two devolved administrations, dividing the island into two territories: Northern Ireland and Southern Ireland. This was implemented as the Government of Ireland Act 1920. The act entered into force as a "" on 3 May 1921 and provided that Northern Ireland would consist of the six northeastern counties, while the remainder of the island would form Southern Ireland. It was intended that each jurisdiction would be granted home rule but remain within the United Kingdom. The government of Southern Ireland never functioned: the war for independence continued until the two sides agreed a truce in July 1921, ending with the Anglo-Irish Treaty on 6 December 1921.
Economic history of Ireland
After the War of Independence, most of Ireland gained independence from the United Kingdom. Twenty-six counties of Ireland became the Irish Free State, later described as the Republic of Ireland, while the other six remained in the Union as Northern Ireland. There had already been a significant economic divide between these two parts of Ireland, but following partition both regions further diverged, with Belfast, as the North's economic centre, and Dublin becoming the capital of the Free State. Partition had a devastating effect on what became Ireland's border area. County Donegal for example was economically separated from its natural regional economic centre of Derry. The rail network struggled to operate across two economic areas, finally closing across a vast swath of Ireland's border area (the only cross-border route left being that between Belfast and Dublin). The last remaining cross-border line (Belfast-Dublin) could not have operated after 1953 without government support.