U.S. citizenship was granted to many inhabitants of the islands in 1927 and 1932. The Danish West Indian daler was replaced by the U.S. dollar in 1934 and from 1935 to 1939 the islands were a part of the United States customs area. The 1936 Organic Act and the 1954 Revised Organic Act established the local government. In 1970, Virgin Islanders elected their first governor, Melvin H. Evans, and from 1976 the islands began work on creating their own constitution. Tourism began to develop, over time becoming the most important sector of the Islands' economy.