That they want to expand building westward, like they did during the purchase. They also wanted to control as much land as they can to explore out west. The Louisana Purchase gave the American explorers new opportunites, doubling the size of the U.S. and from there, they continued to move out west. The Lousiana Purchase in general, partially started the Manifest Destiny. (pardon my grammar)
Because he thought the British navy was coming to his aid
Barge operators C. the Ohio river was nowhere near New York
C. agriculture and industry