There are actually two reasons why Napoleon did so. One was because he knew that if he had held on to it, the United States would start a conflict, and he didn't want that to happen. Also, this is the most important reason, by him helping the United States, and him helping the French treasury at the same time, Napoleon was able to create a world with so much power, that he was able to challenge Britain.
What was the immediate result of the big bottom massacre of 1791? white settlers began to leave ohio. the battle of fallen timbers took place. congress passed the northwest ordinance. more settlers moved into ohio territory.
The Britain,France and the United States embrace the policy of appeasement because they believed that Hitler demands would stop any future pursuits of territories.