The United Kingdom was formed in 1800, when the Irish Parliament merged with the British one. later on, many in Ireland fought against this merger. The result was the separation of the Republic of Ireland. This is not the whole island of Ireland. The rest of the island, Northern Ireland, is now the only part of Ireland still in the UK. England is the only country of UK not to have its own government, Parliament or Assembly, but is governed by Parliament of the United Kingdom. Seats in Parliament are decided by the number of electors in the various parts of the UK.