Mexican Immigrants and Mexican Americans have made far ranging contributions to the United States. Without Mexican Americans, America would be a far poorer country. I cannot even begin to name the things and people who have given so much to this country, and how Mexican Americans have in one way or another changed the face of America. In celebration of Mexican Independence Day, I present here four biographies of Mexican immigrants and Mexican Americans who have made a difference in this country, and who have made a positive influence that has made the United States a truly great country.