During WWII Germany and Japan were enemies of USA; After the war ended these two countries became important allies.
In the 1960s/70s USA loss tens of thousands soldiers in Vietnam fighting against Viet-Cong. Nowadays Viet-Cong is considering to lend a ex-Soviet navy base to USA.
In the 1940's USA aided an anti-government force in China; A few years later they were bitterly defeated by the same force in Korea. Nowadays the leaders of this force send their money as well as family members to reside in USA.
In the 1960s/70s USA loss tens of thousands soldiers in Vietnam fighting against Viet-Cong. Nowadays Viet-Cong is considering to lend a ex-Soviet navy base to USA.
In the 1940's USA aided an anti-government force in China; A few years later they were bitterly defeated by the same force in Korea. Nowadays the leaders of this force send their money as well as family members to reside in USA.