Answer:
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I was thinking maybe c but then A because nationalism gave them more confidence in their country.
The United States placed Japanese Americans into internment camps during World War II because of fear that those with ethnic and cultural ties to Japan would aide Japan's cause in the war. After the surprising attack on Pearl Harbor, the American government (as well as many Americans) worried about Japanese threats and doubted the loyalty of Japanese Americans. - Enotes Website
The XYZ affair is what the diplomatic controversy was better known as.
