Bahamas
Money, the islands in the Caribbean were large trading ports in the 19th and 20th century
Cuba
They are located in the Caribbean Sea, so yes, they are a part of the Caribbean.
Puerto Rico is an autonomous region with US privileges. US Virgin Islands are part of the US.
In the Caribbean, east and slightly south of Puerto Rico.
Because we can
The islands in the Caribbean are Haiti, the British Virgin islands, Dominican Republic, Jamaica, Antigua, and Puerto Rico. They also include Trinidad and Tobago, Barbados, the Turks and Caicos islands.
The Caribbean is a region with many different countries. The Unites States has two Caribbean territories: Puerto Rico and the US Virgin Islands.
The telephone country code for the US (including territories in the Caribbean and Pacific), plus Canada and a bunch of Caribbean/nearby islands, is +1.
The US Virgin Islands and Puerto Rico 'belong to' the US.
No where in the Caribbean is owned by the US ( besides the Us Virgin Islands and Puerto Rico) So therefore you need a passport to get to most places in the Caribbean.