Silicon Valley was energized by legal immigrants from all over the world who founded eBay, Google, Nvidia, SpaceX, Stripe, Sun Microsystems, Tesla, Yahoo and a host of others. The Greek-American Elia Kazan’s 1963 film “America America” is based on the Herculean struggle of the director’s uncle to immigrate to the United States. It summed up Americans’ traditional view of immigrants: They had risked everything for the chance to reach America, and once there, became hyperpatriotic in their gratitude for the magnanimity of their new hosts. I grew up in rural California surrounded by hard-working immigrant farm families from Armenia, India,...