In the early 20th century, several events occurred that led to the adoption of the Constitution of Ireland.

An excerpt from the article 39 facts about Ireland

In 1916, the Easter Rising broke out, then in 1921 the Anglo-Irish Treaty was signed and the first Irish government was established, and finally the Irish Civil War. In 1937, the Constitution of Ireland came into force, under which the state of Ireland was created - this constitution is still in force today.