In Spanish- American war, the Philippines, Puerto Rico, and Guam are the new territories owned by the U.S.
The Spanish-American war began in 1898. The reason behind this conflict is the United States supports the independence of Cuba and safeguards its interest in the business.
As a result of this victory, the United States got ownership over new territories like the Philippines, Puerto Rico, and Guam by defeating Spain.
Therefore, Guam is also owned by the U.S as it was a part of Spain before the war.
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