What is the only Great Lake entirely within U.S. borders? Correct
https://www.youtube.com/watch?v=RKiYsVBgb_k
Lake Michigan is not the only Great Lake entirely within U.S. borders; it is actually the only Great Lake that is not entirely within U.S. borders, as it is also partially bordered by the state of Michigan in the United States. Lake Erie is partially bordered by Canada, Lake Ontario is shared between the United States and Canada, and Lake Superior is shared between the United States and Canada as well. Therefore, Lake Michigan is the correct answer because it is the only Great Lake that is not entirely within U.S. borders.