John Adams was elected the second president of the United States in 1796. During his presidency, he averted war with France through negotiations. However, his signing of the Alien and Sedition Acts damaged his popularity and he lost reelection in 1800 to his vice president, Thomas Jefferson. Jefferson sought to reduce the power of the federal government and reverse some Federalist-era policies. His Louisiana Purchase doubled the size of the United States. Jefferson also sent the Lewis and Clark Expedition to explore the new western lands.