Which territory was annexed by the United States in 1898 and later became a territory in 1900?

The correct answer is Puerto Rico. In 1898, following the Spanish-American War, the United States annexed Puerto Rico. The Foraker Act of 1900 established a civilian government on the island, formally designating it as a territory of the United States. This annexation was part of the broader context of American territorial expansion during this period, which aimed to strengthen U.S. influence in the Caribbean and the Pacific.

Other territories mentioned in the choices have different histories regarding their annexation and status. Guam, also taken in 1898 but did not become a territory until later. Hawaii was annexed in 1898, but it became a territory in 1900 through a separate process involving the Organic Act. The Philippines were acquired in 1898 as well, but they did not officially become a territory until 1901. Therefore, the focus on the timeline of annexation and territorial status points specifically to Puerto Rico as the correct response.