The Gateway Arch, designed by Finnish-born, American-educated architect Eero Saarinen, was erected to commemorate President Thomas Jefferson’s Louisiana Purchase of 1803 and to celebrate St. Louis’ central role in the rapid westward expansion that followed. As the market and supply point for fur traders and explorers—including the famous Meriwether Lewis and William Clark—the town of St. Louis grew exponentially after the War of 1812, when great numbers of people began to travel by wagon train to seek their fortunes west of the Mississippi River. In 1947-48, Saarinen won a nationwide competition to design a monument honoring the spirit of the western pioneers. In a sad twist of fate, the architect died of a brain tumor in 1961 and did not live to see the construction of his now-famous arch, which began in February 1963.