The statement that is generally true about all of the islands of the Caribbean is:
They have a tropical climate.
While many Caribbean islands have Spanish as an official language and there are territories of the United States in the Caribbean, not all islands fall into those categories. For example, islands like Jamaica and Trinidad and Tobago have English as their official language, and there are islands like Puerto Rico that are U.S. territories, but others like Cuba, the Bahamas, and Saint Lucia are not.