Irish Independence By breda Jul 21, 1800 Act of union Jul 21, 1913 1913 Lockout Jul 21, 1914 WW1 Jul 21, 1916 Easter Rising Jul 21, 1919 War of Independence Jul 21, 1921 Civil War Jul 21, 1921 Treaty of 1921 Jul 21, 1921 Northern Ireland Established Jul 21, 1937 Irish Constitution replaces Free State Jul 21, 1949 Republic of Ireland Act