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.