British unionism
| Treaty of Windsor | 1175 |
|---|---|
| Treaty of York | 1237 |
| Treaty of Perth | 1266 |
| Treaty of Montgomery | 1267 |
| Treaty of Aberconwy | 1277 |
| Statute of Rhuddlan | 1284 |
| Treaty of Edinburgh–Northampton | 1328 |
| Treaty of Berwick | 1357 |
| Poynings' Law | 1495 |
| Laws in Wales Acts | 1535–42 |
| Crown of Ireland Act | 1542 |
| Treaty of Edinburgh | 1560 |
| Union of the Crowns | 1603 |
| Union of England and Scotland Act | 1603 |
| Act of Settlement | 1701 |
| Act of Security | 1704 |
| Alien Act | 1705 |
| Treaty of Union | 1706 |
| Acts of Union | 1707 |
| Personal Union of 1714 | 1714 |
| Wales and Berwick Act | 1746 |
| Irish Constitution | 1782 |
| Acts of Union | 1800 |
| Government of Ireland Act | 1920 |
| Anglo-Irish Treaty | 1921 |
| Royal and Parliamentary Titles Act | 1927 |
| N. Ireland (Temporary Provisions) Act | 1972 |
| Northern Ireland Assembly | 1973 |
| N. Ireland Constitution Act | 1973 |
| Northern Ireland Act | 1998 |
| Government of Wales Act | 1998 |
| Scotland Act | 1998 |
| Government of Wales Act | 2006 |
| Scotland Act | 2012 |
| Edinburgh Agreement | 2012 |
| Wales Act | 2014 |
| Scotland Act | 2016 |
| Wales Act | 2017 |
Unionism in the United Kingdom, also referred to as British unionism, is a political ideology favouring the continuation of the United Kingdom of Great Britain and Northern Ireland, or in some cases the enlargement of that state to include other countries such as Ireland.
Unionism was historically a major issue in Ireland, where Irish nationalism was a significant force. Most of Ireland gained independence from the UK in the 1920s. In Northern Ireland, which remained part of the UK, unionism has continued to be a major issue and the main political divide is between unionists/loyalists and Irish nationalists/republicans. This has led to violent conflict in Northern Ireland, most notably the Troubles.
Since the late 20th century support for the Union has become a bigger issue in Scotland and, to a lesser extent, Wales. Following the Scottish National Party's victory in Scotland's 2011 election, a referendum on Scottish independence took place on 18 September 2014: the result supported remaining within the United Kingdom, winning the vote by 55.3% No to 44.7% Yes to the question "Should Scotland be an independent country?".
The Kingdom of Great Britain was formed on 1 May 1707 through the Acts of Union 1707, two simultaneous acts passed by the parliaments of England and Scotland. These created a political union between the Kingdom of England (consisting of England and Wales) and the Kingdom of Scotland. This event was the result of the Treaty of Union that was agreed on 22 July 1706.
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