The National Historic Preservation Act was signed into law by Lyndon B. Johnson on October 15, 1966. This act established several institutions: Advisory Council on Historic Preservation, State Historic Preservation Office, National Register of Historic Places, and the Section 106 review process. The National Register of Historic Places, overseen by the National Park Service, is nation's official list of districts, sites, buildings, structures, and objects worthy of preservation, and are officially designated "historic properties." The State Historic Preservation Office (SHPO) and Officer was established by the NHPA in each state to coordinate statewide inventory of historic properties, nominate properties to the National Register, maintain a statewide preservation plan, assist others, and advise and educate locals.