<P> The state was created as the Irish Free State in 1922 as a result of the Anglo - Irish Treaty . It had the status of dominion until 1937 when a new constitution was adopted , in which the state was named `` Ireland '' and effectively became a republic , with an elected non-executive president as head of state . It was officially declared a republic in 1949 , following the Republic of Ireland Act 1948 . Ireland became a member of the United Nations in December 1955 . It joined the European Economic Community ( EEC ) , the predecessor of the European Union , in 1973 . The state had no formal relations with Northern Ireland for most of the twentieth century , but during the 1980s and 1990s the British and Irish governments worked with the Northern Ireland parties towards a resolution to `` the Troubles '' . Since the signing of the Good Friday Agreement in 1998 , the Irish government and Northern Ireland Executive have co-operated on a number of policy areas under the North - South Ministerial Council created by the Agreement . </P>
<P> The state was created as the Irish Free State in 1922 as a result of the Anglo - Irish Treaty . It had the status of dominion until 1937 when a new constitution was adopted , in which the state was named `` Ireland '' and effectively became a republic , with an elected non-executive president as head of state . It was officially declared a republic in 1949 , following the Republic of Ireland Act 1948 . Ireland became a member of the United Nations in December 1955 . It joined the European Economic Community ( EEC ) , the predecessor of the European Union , in 1973 . The state had no formal relations with Northern Ireland for most of the twentieth century , but during the 1980s and 1990s the British and Irish governments worked with the Northern Ireland parties towards a resolution to `` the Troubles '' . Since the signing of the Good Friday Agreement in 1998 , the Irish government and Northern Ireland Executive have co-operated on a number of policy areas under the North - South Ministerial Council created by the Agreement . </P>
why is southern ireland not part of great britain
why is southern ireland not part of great britain
result of the Anglo - Irish Treaty
result of the Anglo - Irish Treaty