When did people migrate from Mexico to the US?

Here's a timeline of key events and periods in Mexican immigration to the US:

Early 1800s: Mexico gains independence from Spain in 1821. During this time, there are relatively low levels of migration from Mexico to the US, but some movement does occur for economic and political reasons.

1846-1848: The Mexican-American War and the Treaty of Guadalupe Hidalgo result in the United States annexing a significant portion of Mexican territory, including present-day Texas, California, Nevada, Utah, and parts of Colorado, Arizona, and New Mexico. This leads to an increase in Mexican migration to these areas.

Late 1800s-Early 1900s: The late 1800s and early 1900s see increased Mexican migration to the US due to various factors, including economic opportunities and political instability in Mexico. Many Mexicans work in agriculture, mining, and railroad construction.

1924: The Immigration Act of 1924 restricts immigration from Mexico and other countries, but Mexicans are still able to enter the US as non-quota immigrants.

1930-1935: The Great Depression and the Mexican Repatriation Program lead to a decline in the Mexican population in the US, as many Mexicans are pressured or encouraged to return to Mexico.

1942-1945: During World War II, the Bracero Program allows temporary migration of Mexican workers to the US to assist in the agricultural sector while many American workers are serving in the military.

1965: The Immigration and Nationality Act of 1965 removes country quotas and sets a preference system based on family reunification and skills, leading to a renewed increase in Mexican immigration.

Late 1970s-Early 1980s: Undocumented immigration from Mexico increases significantly as economic conditions in Mexico deteriorate and border enforcement is relatively weak.

1986: The Immigration Reform and Control Act (IRCA) grants amnesty to many undocumented immigrants who meet certain requirements, including having been in the US since before 1982.

1990s: Mexican migration to the US continues at a high level, with many entering without proper documentation. Stricter border enforcement measures are implemented in response.

2000-Present: Mexican immigration continues, but the rate has slowed down in recent years. Increased border security and economic factors have contributed to this decline.

Today, Mexican immigrants are a significant part of the US population and have made important contributions to American society, economy, and culture.