Jefferson ran against John Adams, George Washington's vice president. Adams and Jefferson were in a close race, but inconveniently, Jefferson would finish second and become Adams' vice president (Biography.com). During his four years as vice president, Jefferson presided over the Senate, but he held no other official duties during this time. When not busy as vice president, he wrote "A Manual of Parliamentary Practice" which was "one of the most useful guides to legislative procedure ever written" (Biography.com). In 1800, Jefferson decided to run again as one of the Republican candidates for president. He and fellow Republican Aaron Burr each received 73 electoral votes (Biography.com). Since there was a tie, the House of Representatives was able to choose the next president. They chose Thomas Jefferson as the third president and Burr as vice president (Biography.com). Jefferson's first term was extremely successful and productive. Jefferson made many important accomplishments during his presidency, but the Louisiana Purchase of 1803 was the most impressive (Biography.com). The newly acquired lands stretched from the Mississippi River to the Rocky Mountains, doubling the size of the country (Biography.com). The Louisiana Purchase also helped create Manifest Destiny (UShistory.org). The Louisiana Purchase was purchased from Napoleonic France for $15 million (Biography.com). Jefferson was re-elected in 1804, but this term he would face many more challenges than in his first term. He had to face the war between Great Britain and Napoleonic France. Britain and France wanted to prevent Americans from doing business with each other. Jefferson therefore passed the Embargo Act of 1807 which suspended all trade with Europe (Biography.com). This act did nothing positive for the American economy. Thomas Jefferson is gone