What was the first act that congress passed that restricted immigration of the late 1800s coming from?

The first significant act that restricted Immigration in the late 1800s was the Chinese Exclusion Act of 1882. This law prohibited the immigration of Chinese laborers to the United States, reflecting the growing anti-Chinese sentiment and economic concerns of the time. It was the first federal legislation to restrict immigration based on nationality and set a precedent for future immigration restrictions. The act was initially intended to last for ten years but was extended multiple times and remained in effect until 1943.