The Irish Unionist Alliance (IUA), also known as the Unionist Party, was a unionist political party in Ireland which was active from 1891 to 1922. The party opposed plans for Home Rule for Ireland within the United Kingdom due to fears about Catholic-majority "Rome Rule", and it aligned itself closely with the Conservative Party to campaign to prevent the passage of a new Home Rule Bill. Its electoral strength was largely centered among Anglican Protestants in east Ulster and south Dublin, but the issue of the partition of Ireland divided the party during the early 20th century. Unionists in Ulster formed the Ulster Unionist Party, and unionism in Ireland died after the IUA's split in 1919.
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