Jefferson, like many members of the Democratic-Republican Party, believed that states should carry out the powers not mentioned in the Constitution. Therefore, there was no need for the Federal Government to carry out implied powers.
Jefferson believed in a strict interpretation of the Constitution. He believed that the Federal Government should only be able to carry out powers directly stated in the Constitution and did not believe in implied powers.
Lewis and Clark Expedition
Thomas Jefferson made the deal called the Louisiana Purchase with Napoleon. In 1803 he gave 15 million dollars to the French in exchange for lots of land west of the Mississippi River. He believed that land was wealth and that by buying land he was greatly increasing the United States' power.
Ban on British Goods
Thomas Jefferson helped repeal the Judiciary Act of 1801 removing most of John Adams midnight judges. He then appointed several other judges during his term, including William Johnson.
Thomas Jefferson authorized the Lewis and Clark expedition to help explore and map the Louisiana Purchase. He personally tutored Lewis in botany and other fields to make sure the expedition would be a success.
In 1806, in response to British raids on American shipping, Thomas Jefferson helped pass the Non-Importation Acts. These acts called for a boycott of British goods, but they were never enforced.