What former U. S. protectorate is located in the Pacific Ocean west of the U. S.
mainland?

Explanation:

The U.S. has five permanently inhabited territories:-

The territory of Guam

Explanation:

Guam was originally ceded by Spain to the Untied States in 1898, as part of the Treaty of Paris ending the Spanish-American War. Located in the western Pacific Ocean, Guam is the largest and southernmost of the Mariana Islands, and at 210 square miles, the largest island in Micronesia.

answer called a epicycle;