U.S. held (foreign) territories for which postage stamps were issued. These include the Canal Zone, Cuba, the Danish West Indies, Guam, Hawaii, the Philippines, Puerto Rico, and the Ryukyu Islands.
U.S. possessions are the U.S. Virgin Islands, Guam, American Samoa, Swain's Island, Howland Island, Baker Island, Jarvis Island, Midway Islands (this consists of Sand Island and Eastern Island), Kingman Reef, Johnston Atoll, Navassa Island, Swan Island, Wake Island, and Palmyra Island.