The French did not acknowledge that West Florida remained in Spanish possession, and the United States would claim that France had sold West Florida to the United States for several years to come. Though he had not ordered the purchase of the entire territory, Jefferson strongly supported Monroe's actions, which ensured that the United States would continue to expand to the West. Overcoming doubts about whether the Constitution authorized the purchase of foreign territory, Jefferson won congressional approval for the Louisiana Purchase, and the acquisition doubled the size of the United States. Monroe would travel to Spain in 1805 to try to win the cession of West Florida, but, with the support of France, Spain refused to consider relinquishing the territory.[53]
After the resignation of Rufus King, Monroe was appointed as the ambassador to Great Britain in 1803. The greatest issue of contention between the United States and Britain was that of the impressment of U.S. sailors. Many U.S. merchant ships employed British seamen who had deserted or dodged conscription, and the British frequently impressed sailors on U.S. ships in hopes of quelling their manpower issues. 