A. Before 1880s, Chinese people were allowed to come to the United States but they were denied the right of becoming American citizens.
B. From 1882 to 1965 no Chinese were permitted to come to United States because of the Chinese Exclusion Act.
C. The general revision of American immigration laws which allow more Chinese to settle in US was the outcome of World War Ⅱ.
D. During the World War Ⅱ, Chinese were allowed to immigrate again, but the number was controlled.