The USVI is not a country. The USVI is not a state. The USVI is a U.S. territory.
U.S. territories are: the U.S. Virgin Islands, Puerto Rico, Guam, and the Northern Mariana Islands.
Territories of the United States are a type of political division that is directly overseen by the United States federal government, in contrast to states, which share sovereignty with the federal government.
Even though they are U.S. citizens, U.S. Virgin Islands residents cannot vote in presidential elections. The USVI has representation in Congress but the representative cannot vote in Congress.
U.S. Virgin Islands residents, however, are able to vote in presidential primary elections for delegates to the Democratic National Convention and the Republican National Convention.