Question: What St. Louis monument built to honor the westward expansion of the U.S. is near a 1.25 oval race track?

Context paragraphs:
Malcolm W. Martin Memorial Park: Malcolm W. Martin Memorial Park is a park on the east side of the Mississippi River in East St. Louis, Illinois, directly across from the Gateway Arch and the city of St. Louis, Missouri.  Its major feature is the Gateway Geyser, a fountain that lifts water up to 630 ft .  The Gateway Geyser is a counterpart to the equally tall St. Louis monument, and is visible from the west side of the river to the right of the prominent Cargill grain elevator.  Four smaller fountains around the Geyser represent the four rivers which converge near the two cities: The Mississippi, Missouri, Illinois, and Meramec.  The park also includes an elevated viewing point overlooking the river.

Sanair Super Speedway: Sanair Super Speedway is a motorsports park with a 0.826-mile (1.33 km) paved triangular oval race track, a quarter-mile dragstrip, a 1 1/4-mile road course, a 1/3-mile oval, as well as a 0.12-mile mini-oval and 0.15-mile karting course.  It is located in Saint-Pie, Quebec.  It hosted the Molson Indy Montreal from 1984 to 1986.  The dragstrip previously hosted the NHRA's "Le Grandnationals Molson" until Canadian fuel regulations, prohibiting leaded race fuel, forced the NHRA to quit holding a national event in the country.  It currently hosts races in the American Canadian Tour Sèrie ACT Castrol.

Bethel Motor Speedway: Bethel Motor Speedway is a quarter-mile asphalt oval race track, located near the site of the original Woodstock Music Festival in White Lake, New York.  The track was constructed in 1959, and opened for operations in 1960.  It has existed under several names, including White Lake Speedway, Catskill Mountain Speedway, Sullivan County Speedway, and Kauneonga Speedway.  The track closed in 2006 and remained idle through 2007.  Fred Graf Racing, LLC, purchased the speedway, and it reopened under new ownership bearing the Bethel Motor Speedway name on August 9, 2008.  Dave and Joanne Rocket, who promoted races at the speedway from 1998 until 2004, returned as promoters under the new owner.  The speedway was resurfaced in November 2010, providing a new racing surface for the 2011 season.  For the 2011 season, management of the speedway was assumed by Tracy Chirico, Business Operations Manager; and John Condit, Race Director.

Missouri State Fair Speedway: Missouri State Fair Speedway is a half-mile (.805 km) dirt oval race track located at the Missouri State Fair grounds in Sedalia, Missouri.  The track was built along with the fairgrounds in 1901 as a one-mile (1.6-km) horse racing track.  The first auto races were held in 1914 and 1915.  Cars returned from 1935 until 1941, and again from 1946 until 1985 and 1989 until the mile was abandoned in 1998.  One USAC National Championship race was held on the mile in 1970, won by Al Unser.

Montgomery Motor Speedway: Montgomery Motor Speedway is a half-mile (.805 km) oval race track just west of Montgomery, Alabama.  It opened in 1953, and is the oldest operating race track in Alabama.  It held six NASCAR Grand National Series (now Sprint Cup) races between 1955 and 1969.  Huffman Motor Sports purchased the facility on February 5, 1999, and the track was extensively renovated and lighted in 1999.

Cedar Lake Speedway: Cedar Lake Speedway is a 3/8 mile dirt clay oval race track located near New Richmond, Wisconsin.  Named after the nearby Cedar Lake.  It hosts a weekly NASCAR racing program consisting of Late Models, Modifieds, Super Stocks,and Midwest Modifieds It also hosts multi day events such as "The Masters"," "The USA Nationals," "The Legendary 100," and the "Triple Crown."  There is an Indoor Motocross facility and 1/5 mile dirt oval, Cedar Lake Arena, located directly behind the track.

Gateway Arch: The Gateway Arch is a 630 ft monument in St. Louis in the U.S. state of Missouri.  Clad in stainless steel and built in the form of an inverted, weighted catenary arch, it is the world's tallest arch, the tallest man-made monument in the Western Hemisphere, and Missouri's tallest accessible building.  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 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.  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.

Mesa Marin Raceway: Mesa Marin Raceway was a 0.5 mi paved oval race track, located near the junction of CA 178 and CA 184 (Kern Canyon Road), east of Bakersfield, California.  It opened in 1977 and was owned by Marion Collins throughout its existence.  The Collins family helped start the NASCAR Camping World Truck Series (then-Craftsman SuperTruck Series) in 1995, and hosted nine races in that series at the track between 1995 and 2003.  Mesa Marin also hosted 45 races for the Winston West Series and for NASCAR's Southwest Tour.  The last race was held at Mesa Marin on October 16, 2005, as the track was sold for a housing development to be constructed on the site.

Milwaukee Mile: The Milwaukee Mile is an approximately one mile-long (1.6 km) oval race track in the central United States, located on the grounds of the Wisconsin State Fair Park in West Allis, Wisconsin, a suburb west of Milwaukee.  Its grandstand and bleachers seat approximately 37,000 spectators.  Paved in 1954, it was originally a dirt track.  In addition to the oval, there is a 1.8 mile (2.8 km) road circuit located on the infield.

Supporting paragraphs: Gateway Motorsports Park Gateway Arch
Answer: Gateway Arch