Revenue stamps of the United Kingdom
When Ireland was partitioned into Northern Ireland and Southern Ireland in 1921, separate revenue stamps were issued for both entities. Southern Ireland stamps saw little use since that political entity was quickly superseded by the Provisional Government of Ireland and later the Irish Free State (both of which applied overprints on various British and Irish revenue stamps). However, Northern Ireland continued to use separate revenue stamps until the 1980s. Northern Irish revenues include Civil Service, Dog Licence, Excise and National Insurance stamps, among many others.
Irish literature
After 1922 Ireland was partitioned into the independent Irish Free State, and Northern Ireland, which retained a constitutional connection to the United Kingdom. Northern Ireland has for several centuries consisted of two distinct communities, Protestant, Ulster Scots and Irish Catholics. While the Protestants majority emphasise the constitutional ties to the United Kingdom, most Catholics would prefer a United Ireland. The long-standing cultural and political division led to sectarian violence in the late 1960s known as The Troubles, which officially ended in 1998, though sporadic violence has continued. This cultural division created, long before 1922, two distinct literary cultures.