WI - LoN Standing Forces in Europe Post-WW1

France recommended the new League of Nations have an international army to enforce its decisions. Let's assume the Soviets and Germans are excluded, and have this become a 1920's NATO-like force. To work we MUST find a way for USA direct involvement.
 
If this somehow happened, I feel like Chanak would be the real sticking point, not Germany as such.
 
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