It was primarily the "Open Door Policy" that opened relations between china and the united states, since this made it possible for many western countries to engage in trade with China.
A primary source is better than a secondary source because you know that it is absolutely true and that all aspects of the source are true.
Answer:
In their move towards Germany, Hitler's aim was to divide the Allies. ... The Allied line took on the appearance of a broad bulge as the Germans drove into the Ardennes, giving rise to the name of the battle. The war proved to be the costliest ever waged by the U.S. Army, which has lost more than 100,000 victims.
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