The last territory under America's control is American Samoa.

The United States began to administer the islands of American Samoa through the Department of the Navy after it won a bloodless conflict against Germany in 1899, during World War I. The islands were officially made a territory of the United States in 1929, and since then, they have remained an unincorporated, organized territory of the United States.

The reasons why the United States decided to take control of American Samoa are primarily connected to its strategic location in the Pacific Ocean. The United States saw the islands as a crucial way to protect its interests in the region, and the territory has since been an important military base for the United States.

Furthermore, the United States believed that taking control of American Samoa would help spread American values and culture to the Pacific, helping to expand the influence of the United States in the region. In addition, the territory was seen as a valuable source of natural resources, including coconuts, copra, and bananas.

Overall, the decision to take control of American Samoa was driven by a combination of strategic, economic, and cultural interests, and the United States has remained in control of the territory ever since.
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