Yes, U.S. citizens can move to St. Croix with remarkable ease because it is part of the U.S. Virgin Islands (USVI), an unincorporated United States territory. Moving there is legally equivalent to moving between states; no visa, residency permit, or work authorization is required. You can simply pack your bags, book a flight, and start looking for a job or a home. Your U.S. Social Security number remains valid, and you continue to use the U.S. dollar. While you do not need a passport to enter the USVI from the mainland, it is highly recommended to carry one or a birth certificate to facilitate your return to the U.S. mainland, as you will pass through a pre-clearance customs check. It is important to note that while you remain a U.S. citizen, you cannot vote in the U.S. presidential election while residing in a territory, and the local tax system (the Mirror Tax) means you file your taxes with the Virgin Islands Bureau of Internal Revenue rather than the IRS.