Reluctantly after trying appeasement (which was a massive failure) Britain and France had to honor their promise to defend Poland should she be attacked. When she was, Britain and France declared war on Germany.
A. Banned Chinese immigration to the United States for 10 years
Explanation:
The Chinese Exclusion Act of 1882 suspended Chinese immigration for ten years and declared Chinese immigrants ineligible for naturalization. President Chester A. Arthur signed it into law on May 6, 1882.
Computer or phones or the internet :)