As governor of Virginia during the Revolutionary War, Jefferson recommended moving the Cherokee and Shawnee tribes, who had allied with the British, to west of the Mississippi River. But when he took office as president, he quickly took measures to avert another major conflict, as American and Indian societies were in collision and the British were inciting Indian tribes from Canada. In Georgia, he stipulated that the state would release its legal claims for lands to its west in exchange for military support in expelling the Cherokee from Georgia. This facilitated his policy of western expansion, to "advance compactly as we multiply".