The article discusses how the once steady rise in immigrant entrepreneurship in the US has stalled in recent years, threatening economic recovery. Data from 2006-2012 shows the proportion of new companies founded by immigrants has declined slightly, and the decline is more pronounced in Silicon Valley. Stricter immigration laws are making it harder for immigrants to start businesses in the US, prompting some to return home after schooling. This could slow job growth and innovation as immigrant founders start less companies in the US. Economists are concerned this trend may continue without immigration reform to support high-skilled immigrant entrepreneurs.