Immigration policy continues to vex America. For more than a century, the United States has proudly defined itself as the world’s great melting pot of immigrant cultures and talents. And yet, few issues have more sharply divided the modern political landscape. As policymakers grapple with these difficult questions, two critical realities are too often forgotten amid the haze of fractious political debate — the connection between entrepreneurship and economic prosperity, and the importance of immigrants to American entrepreneurship.