In general Subject to paragraph (2), there is established the Ste. Genevieve National Historical Park in the State as a unit of the National Park System to preserve, protect, and interpret for the benefit of present and future generations the themes of French settlement, vernacular architecture, and community form and farming on the frontier associated with Ste. Genevieve. (2) Conditions for establishment The Historical Park shall not be established until the date on which the Secretary determines that— (A) sufficient land has been acquired for the Historical Park to constitute a manageable unit