The Louisiana Purchase

Andrew Jackson's first order as President was to sell the Louisiana Purchase back to France. His second order was to take a ragtag group of Tennessee volunteers out there and claim it right back. He didn't need any pansy-ass French on his western border, and he certainly didn't need to pay anybody to get out of his way.

Jackson tried to do the same thing with Manhattan Island, but he had already killed everyone he might have sold it back too.