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Arlington Heights is a village in Cook County, Illinois, located approximately 25 miles northwest of Chicago's downtown, with a 2020 census population of 77,676 making it the 15th-most populous municipality in the state. Originally inhabited by the Miami Confederacy and later the Potawatomi, the area was ceded to the United States through the 1833 Treaty of Chicago, which sparked white settlement and led to the establishment of West Wheeling in the early 1800s. The village, originally called Deer Grove and later Dunton after settler Asa Dunton established land claims in 1837, received its current name in 1874 and developed as a railroad community when William Dunton sold 16 acres to the Illinois & Wisconsin Railroad in 1853. Arlington Heights is best known for the former Arlington Park Race Track, which hosted the prestigious Arlington Million Thoroughbred race and the Breeders' Cup World Thoroughbred Championships in 2002. The area, which lies primarily in Wheeling Township with portions extending into Elk Grove and Palatine townships, developed from Native American trails that became major roads including Rand Road and Arlington Heights Road. Northbrook is a village in Cook County, Illinois, located in Chicago's upscale North Shore region, with a 2020 population of 35,222. Originally incorporated in 1901 as Shermerville to honor Frederick Schermer, who donated land for the first train station, the village was renamed Northbrook in 1923 to improve its public image, taking its name from the West Fork of the North Branch of the Chicago River that runs through it. The community's population surged from 3,319 in 1950 to 30,735 by 1980 following post-World War II suburbanization, and it became the first Illinois community not bordering Lake Michigan to filter Lake Michigan water for public use. Notable landmarks include Glenbrook North High School (founded in 1953), Northbrook Court shopping mall, the Ed Rudolph Velodrome, the Chicago Curling Club, and the Northbrook Public Library. The village's early history was marked by Potawatomi settlement until the 1833 Treaty of Chicago, followed by pioneer settlement led by Connecticut native Joel Sterling Sherman in the 1830s. Elgin is a city in Cook and Kane counties, Illinois, located 35 miles northwest of Chicago along the Fox River, with a 2020 census population of 114,797 making it the state's sixth-most populous city. Founded in April 1835 by James T. and Hezekiah Gifford following the 1832 Black Hawk Indian War, Elgin initially gained fame for butter and dairy products sold to Chicago, with Gail Borden establishing a condensed milk factory in 1866. The city became nationally prominent through the Elgin Watch Company, which operated the world's largest watchmaking complex from the late 19th century until ceasing production in 1965, with Elgin watches still adorning Chicago's Union Station clocks. Elgin hosted the prestigious Elgin National Road Races from 1910 to 1920, which attracted top racing champions and automobile manufacturers, significantly advancing automobile development. Notable achievements include the city's educational legacy, with Elgin High School producing five Navy admirals, Nobel and Pulitzer Prize winners, and other distinguished alumni, plus the 1990s-opening Grand Victoria Casino, which generated nearly $116 million in community grants and drew nearly four million annual visitors before facing competition from newer casinos.