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Could the NATO have included other U.S. allies from the beginning? I find it rather interesting that the U.S. did not create a treaty organization for East Asia- they could have had Japan, South Korea, and the Republic of China in it. Perhaps NATO expands to have an Asian branch following the Korean War? And as the years go by, it incorporates the nations who otherwise in OTL would have joined these treaty organizations:
Though admittedly many members would leave, just as in OTL when CENTO/METO fell apart. Ultimately, though, I think there are some additional nations that could uncontroversially become NATO members- Japan, South Korea, Australia, and New Zealand. [Oh wait I guess they already do that -ed].