After U.S. territories acquired in the Spanish–American War the uUS supreme court decided how new territories were to be handled. The series of opinion given by supreme court is called Insular Cases.
The United States had to decide whether or not persons in newly gained territory were citizens when the war ended in 1898. The Supreme Court ruled that not all areas under American authority automatically enjoy full constitutional protection of rights. This meant that because unincorporated areas like Puerto Rico were not a part of the United States, their residents may not have all of their constitutional rights, "even if they are U.S. citizens."
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