16 U.S.C. § 410nnn–1 — Palo Alto Battlefield National Historical Park

(a) Establishment — This subsection creates the Palo Alto Battlefield National Historical Park (called "the historical park") in Texas. Its purpose is to preserve, for today's and future generations' education, benefit, and inspiration, the nationally significant site of the first battle of the Mexican-American War. It also aims to explain that battle and the wider war — including the political, diplomatic, military, and social causes and consequences behind it. (b) Boundary (1) In general — The historical park covers about 3,400 acres, shown on the map "Palo Alto Battlefield National Historical Park," numbered 469-80,002, dated March 1991. That map is kept on file at the offices of the Director of the National Park Service. (2)(A) In addition to that original land, the historical park also includes about 34 acres shown on a 2008 boundary-expansion map. And once a further parcel of about 166.44 acres — shown on a 2018 map as the "Fort Brown Unit" — is actually donated to the United States, that land becomes part of the park too. Before the Secretary of the Interior (called "the Secretary") can accept any of this donated land, the Secretary must first complete a boundary study, checking whether adding the land makes sense. If that study finds the addition feasible and appropriate, the Secretary may accept the land and start managing it as part of the historical park — but only after telling Congress about that finding. (B) All these maps are kept on file at National Park Service offices for public viewing. (3) Legal description — Within 6 months after any land is added to the park's boundary, the Secretary must file a written legal description with the House Committee on Interior and Insular Affairs and the Senate Committee on Energy and Natural Resources. This legal description carries the same legal force as if it were written directly into this subchapter, except that the Secretary may fix clerical and typographical errors in it and in the related maps. The legal description is also kept on file for public viewing. The Secretary may make further small boundary revisions from time to time.