The main purpose of this legislation is to prevent the renaming of the Great Lakes in the United States. It aims to protect the historical and geographical names of these significant bodies of water, ensuring they remain unchanged. The key provisions of this legislation include a clear prohibition against any federal action that would alter the names of the Great Lakes, specifically Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario. It states that the President, the Secretary of the Interior, and any federal employees cannot rename these lakes.