Between 1891 and 1920 more than 18 million immigrants entered the United States. While many Americans responded to this influx by proposing immigration restriction or large-scale "Americanization" campaigns, a few others, figures such as Jane Addams and John Dewey, adopted the image of the melting pot to oppose such measures. These Progressives imagined assimilation as a multidirectional process, in which both native-born and immigrants contributed...