There are a variety of Library of Congress subject headings that are used to describe Latinos in the United States. The most common ones include
This is the official term used to describe United States citizens of Latin American descent. Works on citizens of Latin American countries are entered under Latin Americans. Works on citizens of Latin American countries in the United States are entered under Latin Americans--United States.
There are also narrower terms that might be used:
Mexican Americans This heading is used instead of Chicanos or Hispanos.