Answer:
Purchased the Louisiana Territory.
Explanation:
Jefferson's most significant accomplishment as president was the Louisiana Purchase. In 1803, he acquired land stretching from the Mississippi River to the Rocky Mountains from cash-strapped Napoleonic France for the bargain price of $15 million, thereby doubling the size of the nation in a single stroke.
2 -voting in an election
4 -volunteering at a school
5 -helping clean up a neighboorhood