What was the effect of anti-Chinese riots and discriminatory acts against Chinese immigrants in the 1880s? A Rioters who attacked immigrants were put in jail.
B. The American government enacted new laws to protect immigrants.
C. New laws were passed to stop Chinese immigration to the US.
D. Chinese immigrants successfully sued the cities of San Francisco, California, and Tacoma,
Washington, for failing to protect their civil liberties.

The answer is C. New laws were passed to stop Chinese immigration to the US.  

Explanation:

The anti-Chinese movement grew significantly during the 1880’s. With pressure from California, the federal government became involved as the movement gained national support. The federal government moved to stop Chinese immigration altogether. In the 1868 Burlingame Treaty with China, the U.S. government had encouraged the immigration of Chinese nationals to the United States. Just over a decade later, the Chinese Exclusion Act of 1882 suspended all immigration of Chinese to the United States. This act was amended in 1884 to make it more difficult for Chinese laborers working in the United States who left the country to return.  

After new Chinese immigration was mostly eliminated, the anti-Chinese movement turned its attention against Chinese who were already residing in the United States. There had been scattered incidents of violence in California against Chinese during the 1870’s, but the movement became more violent throughout the West during the mid-1880’s. This tension had been growing in both the mining fields and along the railroads—two sectors of the economy that employed large numbers of Chinese workers. In 1885, large-scale violence erupted in Rock Springs, Wyoming, where white vigilantes stormed through the Chinese community, killing many people and driving away many of the rest. Additional incidents later occurred in other Chinatowns throughout the Far West.  

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the thirteen colonies are:

connecticut, delaware, georgia, maryland, massachusetts, new jersey, new york, new hampshire, north carolina, pennsylvania, rhode island, south carolina, virginia