Answer:
The Spanish American War
Step-by-step explanation:
The Spanish American War was a war between American and Spain in which America justified its invasion of Cuba by accusing Spain of destroying the USS Maine.
Guam used to be a Spanish colony, but during the Spanish-American war it was taken by American forces, and it remains an American territory to this day.
Other territories, such as Puerto Rico, were also taken from Spain. Some countries that are independent today were invaded and taken by the US, such as Cuba and the Philippines.