AHC: US State in europe

Maybe in a scenario with a messier end to the First World War and a more interventionist United States, the League of Nations hands some contested cities of Europe over to the Americans for safekeeping? Say, Danzig, and perhaps Constantinople if the situation with Greece, Turkey, and Bulgaria goes a little bit differently.
 
Great Britain loosing control of the mainland, either by revolution, civil war or occupation in a war with no direct US involvement, the US might be tempted to secure Gibraltar for strategic reasons, similar to the Panama Canal Zone.
Although, to achieve statehood that's maybe a bit too small.
 
There were proposals after WWI that Armenia become a LoN mandate under our protection, but we realized that it would be a money pit, and the rising isolationist sentiment rendered it impossible.
 
Maybe in a scenario with a messier end to the First World War and a more interventionist United States, the League of Nations hands some contested cities of Europe over to the Americans for safekeeping? Say, Danzig, and perhaps Constantinople if the situation with Greece, Turkey, and Bulgaria goes a little bit differently.
This seems a tad out there. What about if Russia took Constantinople during the Russo-Turkish war, and it still went red with the US taking the city to secure the Dardanelles? It’s not too un-like the timelines where Russia keeps Alaska and the us takes it during the Russian civil war.
 
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