Jefferson was a heavy believer in state's rights. He believed that the federal government should be reduced, and he expanded the right to vote because he eliminated the requirement of owning land.
Jefferson thought that the Constitution was a strict document, meaning that there was no room for change and no room for implications at all. He rejected the idea of the Implied Powers and argued that if something is not directly written in the Constitution it should not be acknowledged.
Jefferson signed off the Louisiana Purchase in 1803 between U.S. and France. France needed money because there was war in Europe, and Napoleon didn't see a need for the territory. Jefferson was a strong believer in land and believed that land was equivalent to power, and there was also more space and more resources to be found. He purchased it for about $15 million.
Motivated by the election of 1800, Congress passed the Twelfth Amendment of the Constitution. This amendment required electors to vote for the President and the Vice President separately, ending the tradition of having the runner-up become Vice President and left less chance for a tie. This was ratified in 1804.
The Twelfth Amendment
In 1807, three weeks before Great Britain abolished Atlantic slave trade, Jefferson signed a law prohibiting the importation of slaves into any place within the U.S.
Abolition of Slave Trade
In 1809, Thomas Jefferson passed the Non-Intercourse Act passed by Congress. This act legalized trade with all nations except for France and Great Britain, although trade could be possible in the future if these countries acknowledged American claims to equal shipping rights.