1. Short title This Act may be cited as the Cahokia Mounds Mississippian Culture National Historical Park Act . 2. Cahokia Mounds Mississippian Culture National Historical Park, Illinois and Missouri (a) Definitions In this section: (1) Historical park The term historical park means the Cahokia Mounds Mississippian Culture National Historical Park established by subsection (b). (2) Map The term map means the map entitled Cahokia Mounds Mississippian Culture National Historical Park, Boundary , numbered CMMC–NHP–107, and dated 05–31–2019. (3) Secretary The term Secretary means the Secretary of the Interior. (4) State The term States means the States of Illinois and Missouri. (b) Establishment (1) In general Subject to paragraph (2), in order to preserve and interpret for the benefit of present and future generations the historical, cultural, and natural resources associated with the life of the Mississippian Culture, there is established, as a unit of the National Park System, the Cahokia Mounds Mississippian Culture National Historical Park in Collinsville, Illinois, and Monroe, Madison, and St. Clair Counties, Illinois, and St. Louis City County, Missouri. (2) Determination by Secretary The historical park shall not be established until the date on which the Secretary determines that a sufficient quantity of land, or interests in land, has been acquired to constitute a manageable unit. (3) Notice Not later than 30 days after the date on which the Secretary acquires the land under subparagraph (B), the Secretary shall publish in the Federal Register notice of the establishment of the historical park. (4) Availability of map The map shall be on file and available for public inspection in the appropriate offices of the National Park Service. (c) Boundary The boundary of the historical park shall be the boundary as depicted on the map. (d) Land acquisition The Secretary may acquire land and interests in land within the boundary of the historical park by donation, purchase from a willing seller with donated or