1. Short title This Act may be cited as the Emmett Till and Mamie Till-Mobley and Roberts Temple National Historic Site Act . 2. Definitions In this Act: (1) National Historic Site The term National Historic Site means the Emmett Till and Mamie Till-Mobley and Roberts Temple National Historic Site established by section 3(a). (2) Roberts Temple The term Roberts Temple means the Roberts Temple Church of God in Christ, Chicago, Illinois. (3) Secretary The term Secretary means the Secretary of the Interior. 3. Emmett Till and Mamie Till-Mobley and Roberts Temple National Historic Site (a) Establishment Subject to subsection (b), there is established the Emmett Till and Mamie Till-Mobley and Roberts Temple National Historic Site in the State of Illinois as a unit of the National Park System. (b) Conditions of establishment (1) In general The National Historic Site shall not be established until the date on which the Secretary determines that an agreement entered into between the Secretary and the Roberts Temple providing for public access to, and interpretation, operation, and maintenance of, the National Historic Site that is sufficient to constitute a manageable park unit. (2) Notice Not later than 30 days after the date on which the Secretary makes a determination under paragraph (1), the Secretary shall publish in the Federal Register notice of establishment of the National Historic Site. (c) Purpose The purpose of the National Historic Site is to preserve, protect, and interpret for the benefit of present and future generations resources associated with— (1) the Great Migration; (2) the memorial service and funeral of Emmett Till; (3) the story of the courage and activism of Mamie Till-Mobley that was demonstrated as Mamie Till-Mobley transformed the murder of her son into a powerful symbol of racial injustice; and (4) the civil rights movement. (d) Map