The united states declared war on japan because of the attack on pearl harbor.
a. true
b. false

It's a. True.
The United States had remained neutral in World War II till Japan attacked them on Pearl Harbor.

Hope this helps~

Although Japan and Europe did not have any direct contact with one another during the medieval and early modern periods, they independently developed very similar class systems, known as feudalism. Feudalism was more than gallant knights and heroic samurai, it was a way of life of extreme inequality, poverty, and violence.