Immigration makes America what it is and is formative for what it will become. America was settled by three different models of immigration, all of which persist to the present. The Virginia Colony largely equated immigration with the arrival of laborers, who had few rights. Massachusetts welcomed those who shared the religious views of the founders but excluded those whose beliefs challenged prevailing orthodoxy. Pennsylvania valued pluralism, becoming the most diverse colony in religion, language, and culture. A fourth, anti-immigration model also emerged during the colonial period, and was...