Answer:
He abused his executive power notably with one of the largest purchases made in the U.S history. This purchase was of Louisiana (which belonged to France at the time) for 15 mil which today would be $545,893,670.89. That's a whole lotta money!! Anyways, this was a major no-no and the purchase of the state was double what the whole of the U.S was worth so you probably get it.