History: American Old West, United States

During European settlement of North America in the 17th century, the western frontier was the crest of the Appalachian Mountains, the initial geographical impediment to expansion. While the eastern seaboard was being tamed, the area west of these mountains received little concern and speculation. After the American Revolutionary War, the conflict among European powers over the vast American continent and its riches gave way to the new nation of the United States. With peace came an impetus for westward expansion, as veterans returned to areas seen during the war, and land hungry settlers traveled to newly available lands in New York and across the Appalachians.
At the beginning of the 19th century, the American frontier was approximately along the Mississippi River, which bisects the continental United States north-to-south from just west of the Great Lakes to the delta near New Orleans. St. Louis, Missouri was the largest town on the frontier, the gateway for travel westward, and a principal trading center for Mississippi River traffic and inland commerce.
The new nation began to exercise some power in domestic and foreign affairs. The British had been driven out of the East after the American Revolutionary War but remained in Canada and threatened to expand into the Northwest. The French had left the Ohio Valley but still owned the Louisiana Territory from the Mississippi River west to the Rockies, including the strategic port of New Orleans. Spain's dominion (New Spain) included Florida and the territories from present-day Texas to California along the southern tier and up to what later would be Utah and Colorado.
With a stroke of the pen, Thomas Jefferson, the third president of the United States (elected in 1800), more than doubled the size of the United States with the Louisiana Purchase of 1803 which acquired land France had acquired from Spain just three years earlier. Napoleon Bonaparte had begun to consider it a liability, since the slave rebellion in Haiti and tropical disease undermined his Caribbean adventures. Robert R. Livingston, American ambassador to France, negotiated the sale with French foreign minister Talleyrand, who stated, "You have made a noble bargain for yourselves, and I suppose you will make the most of it".