Answer:
Jefferson had many motives, one of them being that he did not want other countries to have any more control over the area then what they already had. Another reason why the President wanted the territory was for future protection, expansion, and he liked the mystery of owning unknown land. Thomas Jefferson wanted to allow for american expansion towards the west so when he was given the chance to buy the Louisiana Territory he took it.
Explanation:
Thomas Jefferson believed that by purchasing the Louisiana territory it would make more Americans want to explore further west, therefor it would help with the expansion of what the Americans owned/claimed.
The purchase of the vast territory made the vision a reality because Thomas Jefferson really did alter the shape of a nation along with the course of history.