I find this 1917 poster interesting because it seems to target urban, working-class immigrants. Besides the dress of the people waiting in line to lend Uncle Sam some money, there is the American flag held by the child, whose enthusiasm attracts the attention of the adults around her.
Children, whether immigrants themselves or native born, seem to have played a special role in immigrant families, mediating in different ways the adults’ encounter with the culture and institutions of the new country. Certainly the authorities saw such potential in these children.*
* On this last point, see Simone Lässig, “The History of Knowledge and the Expansion of the Historical Research Agenda,” Bulletin of the German Historical Institute 59 (Fall 2016): 29–32.