In the late 1800s the government banned immigration through?

In the late 1800s, the U.S. government implemented restrictive Immigration policies, notably with the Chinese Exclusion Act of 1882, which effectively banned Chinese laborers from immigrating to the United States. This was the first significant law to restrict immigration based on nationality and race. Subsequent legislation, such as the Immigration Act of 1891, further established barriers against certain groups and laid the groundwork for more restrictive immigration policies in the 20th century.