The decision to establish a republic in 1919, rather than any other form of government, was significant because it amounted to a complete repudiation of all constitutional ties with Great Britain, and set the party against any compromise that might involve initial self-government under the Home Rule Act 1914 or continued membership of the British Empire. One obstacle to this decision—that the Unionists of the north-east had long indicated that they would never participate in any form of a republic—was left unresolved, the six north-eastern counties remaining part of the United Kingdom under the Government of Ireland Act 1920, and later the Anglo-Irish Treaty.