After WW2 the world quickly realigned to face new enemies. The Marshall plan helped to rebuild Europe, but the stakes were pretty high for anyone near soviet occupied territory, eg, Italy, Germany, and Japan. The USA and USSR were the only nuclear powers at first, so everyone had to pick a nuclear umbrella (a protector with nukes) early on and things progressed from there. Anyone that sided with the USSR was going to have a proletarian uprising, so countries that were not in the USSR’s grasp and had an established ruling elite tended to side with the USA. Over time those connections were formalized into NATO.
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