Why the US invade Puerto Rico?

Answer 1

Puerto Rico is part of the United States, as a Commonwealth since 1952. Before Puerto Rico was a territory of the United States, since 1898, when it was transeferred to the United States from Spain, when the latter lost the Hispanic-American War. Being Puerto Rico, part United States, the US Army like other Armed Forces of the United States were in Puerto Rico during that period as they were in any of the States or territories of the United States. During that period the US Armed Forces were in different countries of the world, like England, Italy, France etc.