The United States responded to Japanese imperialism in the 1930s by: O A. blockading Japanese ports to prevent any Japanese warships
from leaving.
B. refusing to supply Japan with oil until it ended its expansionist
policies.
C. urging Japan to redirect its imperialist efforts toward Africa
instead of Asia.
O D. sending U. S. military forces to protect Japan's neighbors in East
Asia.

B. refusing to supply Japan with oil until it ended its expansionist

policies.

Explanation:

The United States embargoed all oil exports to Japan in hopes that Japan would stop expanding. Instead, it heightened tensions between the nations and forced Japan to continue to invade to reacquire the lost resource source. The strained relations would explode in the Attack on Pearl Harbor on December 7, 1941.

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treaties

explanation:

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.