1920s
| Year | Date | Event |
| 1926 | 25 October | The Balfour Declaration 1926 establishes the principle of the separate and equal status of the dominions within the British Empire, "freely associated as members of the British Commonwealth". |
| 1927 | 12 April | The Royal and Parliamentary Titles Act 1927 changes the title of the British monarch, to reflect the changed constitutional circumstances between Great Britain and Ireland. |
Read more about this topic: Timeline Of Commonwealth Of Nations History