Michael Collins (Irish leader)
The negotiations resulted in the Anglo-Irish Treaty which was signed on 6 December 1921. In it, a new state was agreed upon, called the "Irish Free State". The agreement made an all-Ireland state possible. The six-county region in the northeast could opt out of the Free State if they wanted to. If this happened, an Irish Boundary Commission was to redraw the Irish border. The Irish Free State was established in December 1922, and as expected, Northern Ireland opted to remain part of the United Kingdom proper.