Transfer Day is observed in the US Virgin Islands every March 31, commemorating the transfer of the islands from Denmark to the United States in 1917. This holiday marks the formal completion of the transfer, which took place after the United States paid Denmark 25 million dollars in gold. The transition was approved by voters in both Denmark and the islands through referendums, granting US citizenship to the inhabitants. The official transfer occurred on January 17, 1917, but the anniversary is celebrated on March 31, when the islands officially became a possession of the United States. This day serves as a reminder of the islands' historical significance and their connection to the broader narrative of American expansion.