I can see what they mean from a scientific/genetic standpoint, but I think that anyone from Mexico is a Mexican just like anyone from America is an American even though it's not a race. Thoughts?
Medical researchers, doctors and census-takers may lump Latinos or Hispanics into one group, but a giant study of Mexican genetics shows there’s really no such thing.
Mexicans themselves show such extreme diversity that someone from the dry north is genetically as different from someone from the Yucatan as a European is from an East Asian.
Before the Spanish conquerers arrived in the 16th century, Mexico was inhabited by Native Americans who had carved out their own, often isolated, kingdoms.
"Mexico harbors one of the largest amounts of pre-Columbian genetic diversity in the Americas," said Stanford’s Dr. Andres Moreno-Estrada.
It will be important as medicine becomes increasingly tailored based on an individual’s genes. Their specific origin — not just a broad racial group — may provide crucial pointers.
"We can't just clump everyone together and call them European Americans or Mexican Americans,” added Dr. Esteban Burchard of UCSF.