Immigrants or their children founded 40% of companies in the Fortune 500, according to the Partnership for a New American Economy. However, a limit on visas for skilled workers is blocking foreign entrepreneurs from starting companies and creating jobs for Americans, according to The Economist. Since 2005, the proportion of businesses started by immigrants in Silicon Valley has declined from 52% to 44%. "America's job-generating machine cannot run at full throttle for long if it is starved of fuel," the magazine notes.

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