A. Ancient Ones
I just looked it up on google
        
                    
             
        
        
        
Answer:
Explanation:
The Truman Doctrine was when The U.S would help nations in need of resisting communism. It affected the Cold War because Stalin of course was with Communism and The U.S was. Stalin and the U.S kept arguing on how to run each other's countries and eventually just came to a big disagreement and decided to cause a war over it.
 
        
             
        
        
        
Wait, who lived in that time?  The answer could be 'war' but I need more information...
        
             
        
        
        
They had signed a treaty. However they did very little to act in concert with one another during the war. Each country had different goals that did not mesh well enough to force them both to come together in formulating a combined strategy. They were referred to as the Axis Powers.