On what date did Hawaii become the 50th member of the Union?

Hawaii became the 50th state of the United States on August 21, 1959. This date is significant in American history as it marks the official admission of Hawaii into the Union after a long process that included a referendum in which the majority of Hawaii's residents voted in favor of statehood. The transition from a U.S. territory to statehood was influenced by various factors, including the strategic importance of Hawaii during and after World War II, and its cultural and political ties to the rest of the nation.

Other dates mentioned, such as July 4, 1960, and January 1, 1961, do not correspond with Hawaii's admission, nor do they have any historical significance related to its statehood. Similarly, December 7, 1941, is remembered primarily for the attack on Pearl Harbor, a pivotal event in World War II, rather than Hawaii's status as a state.