What do you mean colonies? You mean the 13 colonies?
World War I, which lasted through Jul 28, 1914 to Nov 11, 1918.
https://www.history.com/topics/world-war-i/world-war-i-history
Info at the link
Answer: A.Send American Troops to fight in Viatnam
Explanation:
The perfect answer to this question would be "The United States president made the Truman Doctrine which encourage any countries under threat of Communism to be on his side"
The closes answer to that is A Hope it's Right
Puerto Rico <span>not become a U.S. territory </span>