Mexicans are the citizens and nationals of the United Mexican States.The most spoken language by Mexicans is Spanish, but many also speak languages from 68 different Indigenous linguistic groups and other languages brought to Mexico by recent immigration or learned by Mexican expatriates residing in other countries. In 2015, 21.5% of Mexico's population self-identified as having indigenous ancestry, however this also included partially indigenous Mexicans. In 2020, the number was estimated at 11.8 million There are currently about 12 million Mexican nationals residing outside Mexico, with about 11.7 million living in the United States. The larger Mexican diaspora can also include individuals that trace ancestry to Mexico and self-identify as Mexican but are not necessarily Mexican by citizenship. The United States has the largest Mexican population in the world after Mexico at 37,186,361 in 2019.