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 Southern Ireland stamps saw little use since that political entity was quickly superseded by the Provisional Government of Ireland and later the Irish Free State (both of which applied overprints on various British and Irish revenue stamps).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 issue in British politics
Home Rule was passed in 1914, but suspended in operation during the First World War. The issue was finally resolved in 1921 by partitioning Ireland into the quasi-autonomous (Catholic-dominated) Irish Free State in the southwestern four-fifths of the island, and (Prebyterian dominated) Northern Ireland in the remaining fifth, which remained part of the United Kingdom. The next round of troubles emerged in the 1960s, when the Catholics living in Northern Ireland could no longer tolerate the discriminatory policies long imposed on them by the (devolved) government of Northern Ireland. The Troubles 30 years of near civil war that at times had significant impact on British politics finally ended with the Good Friday Agreement of 1998, a power-sharing agreement between the parties in Northern Ireland and a international Treaty between Ireland and the United Kingdom, as co-guarantors.