On June 14, 1900, Hawaii became a U.S. territory and began using U.S. stamps for its mail. American missionaries arrived in Hawaii in 1820. As the white population grew, it became apparent that postal provisions were a necessity. The first attempt at establishing postal regulations was made in the 1840s, with the Organic Act. This was a series of three laws, the second of which established postal rates for inter-island mail and mail to the U.S. These laws were never put into effect.