James Monroe while expanding the United States at the expense of the Spanish Empire, from which he obtained Florida and the recognition of a border across the continent. Faced with the breakdown of the expansionist consensus over the question of slavery, the president tried to provide both North and South with guarantees that future expansion would not tip the balance of power between slave and free states, a system that, Weeks remarks, did indeed allow the continuation of American expansion for the best of four decades. Monroe pursued warmer relations with Britain in the aftermath of the War of 1812. In 1817
James Monroe of Virginia and rose to national prominence as a diplomat in France when he helped negotiate the Louisiana Purchase in 1803. During the War of 1812, Monroe served in critical roles as Secretary of State and the Secretary of War under President James Madison. Facing little opposition from the waning Federalist Party, Monroe was easily elected president in 1816, winning over eighty percent against Rufus King (who hadn't even been chosen by a convention since the Federalists were too weak to organize) of the electoral vote and becoming the last president during the First Party System era of American politics.