Question

why did the united states and other countries enforce a ban on the export of iron, steel, and fuel to japan in the 1930s?

japan already had a surplus of those resources, and it would have hurt its economy.
japan wanted to become the most influential voice at the league of nations.
japan was the first to initiate a trade war with other nations by raising tariffs on imports.
japan pursued an aggressive military policy at the time it invaded china.

Explanation:

In the 1930s, Japan's invasion of China and its aggressive military - expansionist policy were major concerns for the international community. The United States and other countries imposed an export ban on iron, steel, and fuel to Japan as a form of economic pressure to curb its military aggression. Japan did not have a surplus of these resources, and the other options do not directly relate to the reason for the export ban.

Answer:

Japan pursued an aggressive military policy at the time it invaded China.