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city, seat (1825) of Adams county, western Illinois, U.S. It lies on the Mississippi River, there bridged to Missouri, about 140 miles (225 km) northwest of St. Louis. Sauk, Fox, and Kickapoo Indians were early inhabitants of the area. Jacques Marquette and Louis Jolliet stopped at what would become Quincy in 1673 during their exploration along the Mississippi River. The area was settled in 1822 by New Yorker John Wood (12th governor of Illinois, 1860-61). First known as Bluffs, it became the county seat on March 4, 1825, the day that President John Quincy Adams was inaugurated, and was renamed in Adams's honour. During the winter of 1838-39, Mormons found refuge there before proceeding northward along the river to Nauvoo. The city received an influx of German immigrants in the 1840s. Quincy grew rapidly as a river town with the increase in steamboat traffic in the 1850s and became an important shipping point and stop for travelers. Because of the city's proximity to Missouri (a slave state), the issue of slavery created much political controversy. Quincy was a part of the Underground Railroad (a system by which slaves were assisted in escaping to the North and to Canada). The city declined with the passing of the steamboat era in the 1870s, but after 1920 industrial development stimulated its growth. Quincy's economy is based on agriculture (including corn [maize], soybeans, and livestock) and manufacturing (including elevators, radio and television parts, air compressors, petroleum equipment, electronics, wheels, and truck bodies)