Learn about the segregation Jessica Alba’s ancestors faced as Mexican Americans living in California in this clip from Finding Your Roots. Alba’s great-grandfather, Daniel Martinez, emigrated from Mexico and opened a store in Los Angeles. When the store went out of business, his family had to work as migrant laborers. In the early 20th century, segregation kept Mexicans and whites apart in many public places, including schools. Martinez worked with others to establish a school for Mexican students so they could receive an education that celebrated their culture.