What is the overall trend of Mexican immigration to the US in the 20th century?

Beginning around the 1890s, new industries in the U.S. Southwest—especially mining and agriculture—attracted Mexican migrant laborers. The Mexican Revolution (1910-1920) then increased the flow: war refugees and political exiles fled to the United States to escape the violence. Mexicans also left rural areas in search of stability and employment. As a result, Mexican migration to the United States rose sharply. The number of legal migrants grew from around 20,000 migrants per year during the 1910s to about 50,000–100,000 migrants per year during the 1920s.

Explanation:

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