Description that explains why Chicago grew so quickly.

The American Fur Company set up a base of operations in the Great Lakes area. This brought in new businesses and opportunities for trade. In 1848, Chicago opened its first railroad, completed a canal connecting to the Chicago River, and created a formal board of trade. Following the Civil War, Chicago became one of the country's top locations for manufacturing and trade.

In the early days, Chicago was inhabited by Algonquian people. With the opening of the Illinois and Michigan Canal - that runs down to the Gulf of Mexico - and the first rail line to Chicago, the city started to become the national transportation hub with road, rail, water and, air connections. Also, Chicago sits in the center of the most fertile agricultural areas of the United States. Because of all those factors, Chicago grew quickly - in less than 20 years the population grew from 4 thousand inhabitants to 169 thousand.