The vast bulk of Mexico, central America, and South America is mixed. This is usually called "Mestizo" but different countries apply different names. With the exception of Uruguay, the white (Spanish- and don't intermarry)populations of Latin American countries is a small minority, mostly the upper class.
The third group is the truly native descendants, such as the different Mayan tribes, and thousand others.
The fourth group is the black population. In Panama, this group is called "Afro-Arameans." names can vary here also.
Almost all Hispanic immigrants to the U.S. from the 2nd group.