At the beginning of December 1921, the British pressed the Irish delegation hard on the issue of accepting a Boundary Commission to look at territorial claims viz-a-vis Northern Ireland while threatening to resume immediate war if British involvement in a new Irish State was not accepted. While the Irish delegation were very slow to accept such terms, they eventually agreed and signed the Anglo-Irish Treaty on December 6th, 1921. What did this Treaty essentially grant Dáil Eireann?