Naperville is a city in DuPage and Will counties in the U.S. state of Illinois; it was voted the second-best place to live in the United States by Money magazine in 2006. As of the 2010 census, the city had a total population of 141,857. It is the fifth-largest city in the state, behind Chicago, neighboring Aurora, Rockford, and Joliet. Approximately 100,000 Napervillians live in DuPage County, while about 45,000 reside in Will County. Once a quaint farming town, Naperville has evolved into an affluent city with numerous corporate headquarters located in the city. In a 2010 study, Naperville was named as the wealthiest city in the Midwest and eleventh in the nation with a population over 75,000.

In July 1831, Joseph Naper arrived at the west bank of the DuPage River with his family and friends to found what would be known as Naper's Settlement. Among those original settlers were Naper's wife Almeda Landon, his brother John with wife Betsy Goff, his sister Amy with husband John Murray, and his mother Sarah. Their arrival followed a nearly two-month voyage across three Great Lakes in the Naper brothers' schooner, the Telegraph. Also on that journey were several families who remained in the still raw settlement that would become Chicago, including that of Dexter Graves who is memorialized in Graceland Cemetery by a well-known Lorado Taft statue.

Illinois (ⁱ/ˌɪlɨˈnɔɪ/ IL-i-NOY) is the 25th most extensive and the 5th most populous of the 50 United States, and is often noted as a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal, timber, and petroleum in the south, Illinois has a broad economic base. Illinois is a major transportation hub. The Port of Chicago connects the state to other global ports from the Great Lakes, via the Saint Lawrence Seaway, to the Atlantic Ocean; as well as the Great Lakes to the Mississippi River, via the Illinois River. For decades, O'Hare International Airport has ranked as one of the world's busiest airports. Illinois has long had a reputation as a bellwether both in social and cultural terms and politics.

Although the state's largest population centers today are in northern Illinois, originally the state's population grew from south to north, with settlers arriving from Kentucky in the 1810s. In 1818, Illinois achieved statehood. Chicago was founded in the 1830s on the banks of the Chicago River, one of the few natural harbors on southern Lake Michigan. Railroads and John Deere's invention of the self-scouring steel plow turned Illinois' rich prairie into some of the world's most productive and valuable farmlands, attracting immigrant farmers from Germany and Sweden. By 1900, the growth of industrial jobs in the northern cities and coal mining in the central and southern areas attracted immigrants from Eastern and Southern Europe. Illinois was an important manufacturing center during both world wars. The Great Migration established a large community of African Americans in Chicago that created the city's famous jazz and blues cultures.