The answer you seek is isolationism. This is the policy of not forming alliances.
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Before World War One, the United States of America had an isolation policy. This meant that they did not involve themselves in any international affairs or wars. However after World War One, there was a massive shift in their policy and they eliminated their isolation policy.
for the first part they were nutral.(not chosing a side or even fighting.)
Internationalism
The Cold War.
Yes Germany Violated international law in world war 1.