 Important strands of scholarship include research on identity, especially Britishness and Irishness, and studies of the major political movements, such as separatism, unionism and nationalism.The concept of post-nationalism is also contemporary trend in studies of history, culture and politics in the isles.The day after the establishment of the Irish Free State, the Houses of the Parliament of Northern Ireland resolved to make an address to the King so as to opt out of the Irish Free State Immediately afterwards, the need to settle an agreed border between the Irish Free State and Northern Ireland arose.