What St. Louis monument built to honor the westward expansion of the U.S. is near a 1.25 oval race track?
Gateway Motorsports Park: Gateway Motorsports Park (formerly Gateway International Raceway) is a motorsport race track in Madison, Illinois, just east of St. Louis, Missouri, United States, close to the Gateway Arch. Gateway Motorsports Park:  It features a 1.25-mile (2 kilometer) oval used by the NASCAR Camping World Truck Series and IndyCar Series, a 1.5 mi infield road course used by SCCA and various car clubs, and quarter-mile drag strip that hosts an annual National Hot Rod Association event. Gateway Arch: The Gateway Arch is a 630 ft monument in St. Louis in the U.S. state of Missouri. Gateway Arch:  Built as a monument to the westward expansion of the United States, and officially dedicated to "the American people," it is the centerpiece of the Jefferson National Expansion Memorial and has become an internationally recognized symbol of St. Louis, as well as a popular tourist destination.
Gateway Arch