It seems like you are referring to the historical context related to Angel Island, which served as an immigration station in the early 20th century. Based on the options you provided, the correct association would likely be:
controlling the influx of Chinese immigrants to the United States
Angel Island was primarily used to process Asian immigrants, including many Chinese, and it implemented stricter regulations and inspections compared to Ellis Island, which generally served European immigrants. If you have more details or context, feel free to share!