Which of the following is a U.S. territory?

Guam is a U.S. territory located in the western Pacific Ocean. It is important to understand that U.S. territories are regions that are under the jurisdiction of the United States but are not part of the 50 states. Residents of Guam are U.S. citizens, but the territory has its own local government and certain aspects of its governance differ from those of the states.

The other options, Maine, Ohio, and New York, are all states within the United States. Each state has its own government and representation in Congress, while territories like Guam do not have the same level of representation. This distinction makes Guam the correct answer, as it is one of several territories that the U.S. manages without granting them full statehood.