

The majority of these Hispanophone populations eventually adopted English as their first language and became Americanized. Few chose to leave their homes in the States. Mexicans living in the United States after the treaty was signed were forced to choose between keeping their Mexican citizenship or becoming an American citizen. citizens in 1848 through the Treaty of Guadalupe Hidalgo, which ended the Mexican–American War. It is estimated that approximately 10% of the current Mexican American population are descended from early Spanish and Mexican residents such as New Mexican Hispanos, Tejanos, and Californios, who became U.S. Others are Indigenous primarily descended from one or more of the over 60 Indigenous groups in Mexico (approximately 200,000 people in California alone). Most Mexican Americans are of varying degrees of Spanish and Indigenous descent, being made up of varying Peninsular Spanish ( Spaniard born in Spain that resided in the colonies of the Spanish Empire), Criollo Spanish (Spaniard settler born in the colonies of the Spanish Empire), White Mexican (after the independence of Mexico), and Mexican mestizo origin ( multiracial people with a combined European and Indigenous American ancestry). culture which has made some become less connected with their culture of birth (or of their parents) and sometimes creates an identity crisis.

Many Mexican Americans living in the United States have assimilated into U.S. Most Mexican Americans reside in the Southwest (over 60% in the states of California and Texas). is home to the second-largest Mexican community in the world (24% of the entire Mexican-origin population of the world), second only to Mexico itself. In 2019, 71% of Mexican Americans were born in the United States, though they make up 53% of the total population of foreign-born Latino Americans and 25% of the total foreign-born population. population and 61.5% of all Latino Americans. In 2019, Mexican Americans comprised 11.3% of the U.S. Mexican Americans ( Spanish: mexicano-estadounidenses or estadounidenses de origen mexicano) are Americans of full or partial Mexican descent.
