New Philadelphia National Historical Park Act This bill establishes the New Philadelphia Historical Park in Illinois as a unit of the National Park System to coordinate (1) the preservation, protection, and interpretation efforts of the park by the federal government, Illinois, units of local government, and private and nonprofit organizations; and (2) appropriate management options necessary to ensure the protection, preservation, and interpretation of the many significant aspects of the park. The Department of the Interior may acquire for inclusion in the park any land (including interests in land), buildings, or structures by donation, transfer, exchange, or purchase from a willing seller. Interior shall complete a general management plan for the park. Interior may not use eminent domain or condemnation in carrying out this bill.