Final answer:
The view of Americans that justified Japan's attack on Pearl Harbor was influenced by Japanese nationalism and the perceived threat of Japanese expansion in Southeastern Asia. This fear of Japanese aggression led to overwhelming support from the American people for war.
Step-by-step explanation:
The view of Americans that justified Japan's attack on Pearl Harbor was largely shaped by Japanese nationalism and the fear of Japanese expansion in Southeastern Asia. The American people believed that Japan posed a direct threat to US interests in the Pacific, especially after the Japanese military defeated French, British, and Dutch colonial forces throughout the region. The attack on Pearl Harbor intensified this fear, as Americans worried about a potential Japanese invasion of the US mainland. These factors led to overwhelming support among the American people for their president's request for war.