The main purpose of this legislation is to establish the Fort Monroe National Historical Park in Virginia. The park aims to preserve and interpret the historical, natural, and recreational resources of Fort Monroe for the benefit of current and future generations. It highlights significant events and figures associated with the site, including its role in early American history, military history, and the Civil War. Key provisions of the legislation include the formal establishment of the Fort Monroe National Historical Park, which will replace the existing Fort Monroe National Monument.