Irish self-rule were opposed by many Ulster Protestants, sparking the Home Rule Crisis. In the last all Ireland election (1918 Irish general election) counties Donegal and Monaghan returned large Sinn Féin (nationalist) majorities. Sinn Fein candidates ran unopposed in Cavan. Fermanagh and Tyrone had Sinn Fein/Nationalist Party (Irish Parliamentary Party) majorities. The other four Counties of Ulster had Unionist Party majorities. The home rule crisis and the subsequent Irish War of Independence, led to the partition of Ireland under the Government of Ireland Act 1920. Six Ulster counties became Northern Ireland, a self-governing territory within the United Kingdom, while the rest of Ireland became the Irish Free State, now the Republic of Ireland. The term Ulster has no official function for local government purposes in either state. However, for the purposes of ISO 3166-2:IE, Ulster is used to refer to the three counties of Cavan, Donegal and Monaghan only, which are given country sub-division code "IE-U". The name is also used by various organisations such as cultural and sporting bodies. Terminology Ulster's name ultimately derives from the Ulaidh, a group of tribes that once dwelt in this part of Ireland. The Norsemen knew the province as Ulaztir, the tír or land (a word borrowed from Irish) of the Ulaidh; this was then taken into English as Ullister or Ulvester, and later contracted to Ulster. Another, less probable explanation is that the suffix -ster represents the Old Norse element staðr ("place"), found in names like Lybster and Scrabster in Scotland. Ulster is still known as Cúige Uladh in Irish, meaning the province (literally "fifth") of the Ulaidh. Ulaidh has historically been anglicised as Ulagh or Ullagh and Latinised as Ulidia or Ultonia. The latter two have yielded the terms Ulidian and Ultonian. The Irish word for someone or something from Ulster is Ultach, and this can be found in the surnames MacNulty, MacAnulty, and Nulty, which all derive from Mac an Ultaigh, meaning "son of the Ulsterman". Northern Ireland is often referred to as Ulster, despite including only six of Ulster's nine counties. This usage is most common among people in Northern Ireland who are unionist, although it is also used by the media throughout the United Kingdom. Most Irish nationalists object to the use of Ulster in this context. Geography and political sub-divisions Ulster has a population of just over 2 million people and an area of . About 62%