The correct answer would be the Chinese Exclusion Act of 1882. This act greatly restricted the amount of Chinese immigrants allowed into the US during the late 19th century.
This law is an example of nativism because nativism revolves around an anti-immigration policy. People who identified as nativists felt that immigrants would ruin American society, try to change American cultures/views, and would take jobs away from Americans due to their willingness to work for lower pay. This is why the restriction of immigrants from China shows an example of nativism, as it restricts the amount of immigrants allowed into the US.
