Answer:
d. rise in immigration from Europe
Explanation:
In 1868, immediately after the American Civil War, China and the United States signed the Burlingame Treaty, which allowed free immigration between citizens of both countries. But 14 years later, the United States forgot what it had agreed with the Chinese "since the Chinese Exclusion Act was approved at the congress, this" made Chinese immigrants permanent foreigners ", because they were also denied the right to apply US citizenship. The measure had a dramatic social impact since it prevented the reunification of many families, not only by the Chinese who could not enter. "The Chinese who were already in the United States did not dare to leave the country because they feared that the return, the immigration authorities would not allow them to enter. "In 1892, the law was extended another 10 years and in 1902 became permanent.
