California had the highest concentration of Vietnamese or Chinese speakers in the United States, second highest concentration of Korean or Spanish speakers in the United States, and third highest concentration of Tagalog speakers in the United States. California was historically one of the most linguistically diverse areas in the world, and is home to more than 70 indigenous languages derived from 64 root languages in 6 language families. A survey conducted between 2007 and 2009 identified 23 different indigenous languages of Mexico that are spoken among California farmworkers.