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At beginning of twentieth century, East Los Angeles became popular immigrant destination. In early 1900s, Russians, Jews, Japanese, and Mexicans all had significant presence in area. Living east of river and working in nearby factories, or traveling by electric rail into downtown Los Angeles, immigrants and their children helped fuel prosperity of growing metropolis. By onset of World War II, East Los Angeles had almost become exclusively Latino community, soon reinforced by influx of Mexican workers who arrived to man the machines in area's burgeoning war industries.