1. A major increase in European immigration took place during the 1920’s, with many coming from southern and eastern Europe. This trend had which of the following effects?:

A. Most Americans welcomed the immigrants, as they would take less desirable jobs.
B. Congress passed laws that allowed for unlimited immigration.
C. Many Americans were angered by the presence of European-born immigrants.
D. Congress agreed to create preferential immigration laws for eastern and central Europeans to enter the United States more easily.