Step 1 : Introduction to the question "Which Great Lake is the only one located entirely within the United States?"
...Lake Michigan is the only one of the five Great Lakes located entirely within the United States. The other four Great Lakes—Lake Superior, Lake Huron, Lake Erie, and Lake Ontario—all form part of the border between the United States and Canada. Lake Michigan touches four U.S. states: Michigan, Wisconsin, Illinois, and Indiana, and is connected to Lake Huron through the Straits of Mackinac. Lake Michigan is the second-largest Great Lake by volume and the third-largest by surface area, containing more than 1,100 cubic miles of water.
