1848 (Treaty of Guadalupe Hidalgo. Mexico lost a large part of its territory. 1850 Around 100,000 Mexicans remained in the new U.S. territory. 1900 Mexicans moved north to find jobs; the population reached 400,000. 1942 The U.S. allowed Mexican men to work in agriculture during World War Two. 1964 Bracero Program Ends: The program ended; undocumented migration began to rise. 1986 Immigration Reform Law: President Reagan granted legal status to over 2.7 million undocumented immigrants. 1994 NAFTA Effect: NAFTA caused job losses in Mexico, increasing migration to the U.S. 2000s New Generations: Mexican-American families, students, and professionals live in the U.S. 2016–2020 Trump Era: Trump’s government increased deportations and tension against Mexican migrants. 2025 Community and Challenges: Today, 35 million people of Mexican origin live in the U.S., still facing discrimination and challenges.