The Fox Valley—also commonly known as the Fox River Valley—is a rural, suburban, and exurban region within Illinois

Illinois

Illinois is the fifth-most populous state of the United States of America, and is often noted for being 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,...

 and Wisconsin

Wisconsin

Wisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...

 along the western edges of the Chicago and Milwaukee metropolitan area

Milwaukee metropolitan area

The Milwaukee–Racine–Waukesha metropolitan area is an urban area identified by the U.S. Census Bureau containing five counties in southeastern Wisconsin: Milwaukee, Waukesha, Racine, Washington and Ozaukee...

s. This region centers on the Fox River

Fox River (Illinois River tributary)

The Fox River is a tributary of the Illinois River in the states of Wisconsin and Illinois in the United States. There are two other "Fox Rivers" in southern Illinois: the Fox River and a smaller "Fox River" that joins the Wabash River near New Harmony, Indiana.-Wisconsin:The Fox River rises near...

 of Illinois and Wisconsin. Around 1 million people live in this area.
Native American tribes that lived near the Fox River included the Potawatomi

Potawatomi

The Potawatomi are a Native American people of the upper Mississippi River region. They traditionally speak the Potawatomi language, a member of the Algonquian family. In the Potawatomi language, they generally call themselves Bodéwadmi, a name that means "keepers of the fire" and that was applied...

, Sac

Sac (tribe)

The Sacs or Sauks are a group of Native Americans of the Eastern Woodlands culture group. Their autonym is The Sacs or Sauks are a group of Native Americans of the Eastern Woodlands culture group. Their autonym is The Sacs or Sauks are a group of Native Americans of the Eastern Woodlands culture...

, and Fox tribes.

Some of cities in the Fox River Valley are part of the rust belt

Rust Belt

The Rust Belt is a term that gained currency in the 1980s as the informal description of an area straddling the Midwestern and Northeastern United States, in which local economies traditionally garnered an increased manufacturing sector to add jobs and corporate profits...

.