Art, math, science, maybe psychology
Answer:
The Cold War between the U.S. and Soviet Union originated from postwar disagreements, conflicting ideologies, and fears of expansionism. At both the Yalta Conference and Potsdam Conference, U.S. and Soviet leaders sharply disagreed over the future of the post-war world.

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The Cold War | Boundless US History
got it from ^
A state in China called Manchukuo is the place where Japan established it as a puppet state in 1932. This was made possible when the Japanese army created an excuse to attack the Chines troops in 1931 then on 1932, it was proclaimed as an independent state which was used as their base for expansion to Asia.
Answer:
C
Explanation:
A. Britain was never invaded during WW1
B. German forces had already occupied Belgium and Poland since 1915, that was not a contributing factor to American intervention
D. Russia never signed a treaty of alliance with the Germans
Using process of elimination, you can determine that C is the correct answer
