When did Hawaii become an official U.S. Territory?

Hawaii became an official U.S. Territory on June 14, 1900, when the Organic Act was enacted by Congress. This Act established the government of the Territory of Hawaii, signifying a significant moment in the archipelago's transition from a sovereign nation to a territory of the United States. The Organic Act provided for a system of governance similar to that of other U.S. territories, thus laying the groundwork for its eventual statehood.

The date is pivotal in understanding the historical timeline of Hawaii's incorporation into the United States and its governance structure. It marked the beginning of a new era in Hawaii's relationship with the U.S., allowing for greater federal oversight and the introduction of American laws.

Other dates, such as those mentioned in the choices, do not align with the official designation of Hawaii as a U.S. Territory. While August 21, 1959, marks the date Hawaii achieved statehood, it was not when it became a territory. The other dates either precede or incorrectly assign the designation of territorial status to Hawaii.