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.
Scottish independence
The United Kingdom of Great Britain and Ireland was formed by the Acts of Union 1800, which united the Kingdom of Great Britain and the Kingdom of Ireland. The 26 southern counties of Ireland left the Union in 1922, which became known as the United Kingdom of Great Britain and Northern Ireland.