Elon Musk and the other tech moguls fluttering around Donald Trump claim that Silicon Valley needs more H-1B visas to bring in foreign workers because there aren’t enough Americans studying science and tech. But what they don’t tell you is that for more than a decade, Americans working in the tech industry have been systematically laid off and replaced by cheaper H-1B visa holders. When Americans realize they can’t make a living as software engineers, they leave the industry. The H-1B program worsens the very shortages it was supposed to address.