Question. Context: The U.S. has five territories that are permanently inhabited: Puerto Rico and the U.S. Virgin Islands in the Caribbean Sea; Guam and the Northern Mariana Islands in the Marianas archipelago in the western North Pacific Ocean; and American Samoa in the South Pacific Ocean.

Question: what caribbean island is part of the united states?
Answer. Puerto Rico and the U.S. Virgin Islands
What step-by-step reasoning justifies that answer?
Reasoning: The relevant information to answer the above question is: The U.S. has five territories that are permanently inhabited: Puerto Rico and the U.S. Virgin Islands in the Caribbean Sea; Guam and the Northern Mariana Islands in the Marianas archipelago in the western North Pacific Ocean; and American Samoa in the South Pacific Ocean.