Most were Mexican Americans of Spanish descent and other Hispanicized European settlers who settled in the Southwest during Spanish colonial times, as well as local and Mexican Indians.
Mexican-American history spans more than 400 years and varies from region to region within the United States.
In 1900, there were slightly more than 500,000 Hispanics of Mexican descent living in New Mexico, Arizona, Nevada, Colorado, California and Texas.
Many Mexicans were more loyal to their states/provinces than to their country as a whole, which was a colony of Spain.
This was particularly true in frontier regions such as Zacatecas, Texas, Yucatán, Oaxaca, New Mexico, etc.
Although the events of 1836 led to independence for the people of Texas, the Hispanic population of the state was very quickly disenfranchised, to the extent that their political representation in the Texas State Legislature disappeared entirely for several decades.