Hispanics Become U.S. Citizens

1846
The United States invades Mexico under the banner of Manifest Destiny. The Treaty of Guadalupe Hidalgo ends the Mexican War that same year. Under the treaty, half the land area of Mexico, including Texas, California, most of Arizona and New Mexico, and parts of Colorado, Utah, and Nevada, is ceded to the United States. The treaty gives Mexican nationals one year to choose U.S. or Mexican citizenship. Approximately 75,000 Hispanic people choose to remain in the United States and become citizens by conquest.