By the time American troops entered World War 1 the Allies were exhausted after years of fighting. The correct option among all the options that are given in the question is the third option or option "c". The entry of Americans in the war boosted the morale of the Allied army. I hope the answer comes to your help.
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Answer: Jews and Roma (Gypsies).
Explanation: together the ss and the Gestapo managed the treatment of inferior races.
The city you are looking for is Beijing