Timeline 3 for project of United States History II By Billyboy1326667 1970 Occupational Safety and Health Act 1970 Secret bombings Nixon secretly authorized bombing campaigns and a ground invasion on a neutral Cambodia. Period: 1970 to 1975 1970 - 1975 1971 Federal Election Campaign Act 1971 Endangered Species Preservation Act This act was a means for listing native animals species as endangered and giving them limited protections. 1973 OPEC stopped exports to US