The Irish Free State was established with Dominion status following the Anglo-Irish Treaty.
A new constitution was adopted, renaming the state to 'Ireland' and establishing a non-executive president.
Ireland was officially declared a republic under The Republic of Ireland Act.
Ireland became a member of the United Nations, enhancing its international presence.
Ireland joined the European Communities, the predecessor of the European Union.
The Good Friday Agreement was signed, promoting cooperation between the Irish and Northern Irish governments.