There are five avenues through which a person can have dual United States and Trinidad citizenship.
Birth
If you were born in Trinidad and either one of your parents is a U.S. citizen.
Parents
If your U.S. citizenship was through ancestry (either one of your parents is a U.S. citizen).
Voluntary Act
You voluntarily became a U.S. citizen before July 29, 1988. By doing so, you lost your Trinidad citizenship, but you can apply for restoration of your Trinidad citizenship.
Ancestry
If you acquired your U.S. citizenship after July 28, 1988, and you are a citizen of Trinidad by birth or ancestry, you will not lose your Trinidad citizenship.
Naturalization
If you got your U.S. citizenship after July 28, 1988, but you are a citizen of Trinidad by means other than birth or ancestry you may apply for the restoration of your Trinidad citizenship.