Answer:
A. Chinese
Step-by-step explanation:
In 1882, the United States Congress passed the Chinese Exclusion Act, which suspended Chinese immigration for ten years and barred Chinese immigrants already in the United States from becoming citizens. The act was later extended and remained in effect until 1943.
While there were earlier restrictions on immigration, such as the Naturalization Act of 1790, which limited citizenship to "free white persons," the Chinese Exclusion Act was the first law that specifically targeted a particular ethnic group and severely restricted their immigration to the United States.