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US territories that once belonged to other countries

From Alaska to Guam, get to know the complex history of American expansion

US territories that once belonged to other countries
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StarsInsider
04/11/2026 18:15 ‧ 1 hour ago | StarsInsider

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The map of the United States extends far beyond the continental mainland, encompassing a diverse collection of islands and atolls. Many of these territories were not originally settled by Americans but were acquired through treaties, purchases, or strategic annexations from other sovereign powers.

From the Caribbean to the vast stretches of the Pacific, these lands were once governed by empires such as Spain, Russia, and Germany, or were part of independent island kingdoms like Hawaii. Understanding the origins of these territories reveals a history of diplomacy, conflict, and expansion that shaped the modern US borders.

This gallery showcases some of these locations, highlighting their former owners and the paths they took to become part of the US. Curious? Read to know more.

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