By 1900, the United States had become a major power in which region?

By 1900, the United States had established significant influence and presence in the Pacific region, making it a major power there. This evolution can be traced back to strategic developments such as the acquisition of territories following the Spanish-American War in 1898, which included Guam and the Philippines. These islands provided the U.S. with important coaling stations and naval bases, enhancing its military and commercial reach across the Pacific.

Additionally, the annexation of Hawaii in 1898 was crucial, as it served as a significant gateway to Asia and bolstered U.S. interests in trade and military strategy within the Pacific. The Open Door Policy regarding China illustrated America's expanding economic interests in Asia. This policy aimed to ensure equal trading rights for all nations and maintain China's territorial integrity, further defining American involvement in the region.

The U.S. also sought to extend its influence through various means, including diplomacy and military interventions, which contributed to its emergence as a dominant force in the Pacific by the turn of the century.