In 1803, the US Army built Fort Dearborn on a tract of land along the Chicago River that had been acquired from the Native Americans after the Northwest Indian War. Over time, the settlement that grew up around the fort was incorporated as a city. A major port and the commercial, financial, industrial, and cultural center of the Midwest, Chicago is now the third-largest city in the US. Its name is derived from the Native American word shikaakwa, meaning “onion field,” a reference to what? Discuss