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In page 1918 Irish general election:

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The IPP strove for Home Rule, that is, limited self-government for Ireland within the United Kingdom, and had been supported by most Irish people, especially the Catholic majority. Home Rule was opposed by most Protestants in Ireland, who formed a majority of the population in the northern province of Ulster but a minority in the rest of Ireland, and favoured maintenance of the Union with Great Britain (and were therefore called Unionists).