AFAIK it's significantly more nuanced. Actually China did support Vietnam in the war - https://en.wikipedia.org/wiki/Vietnam_War#People's_Republic_of_China http

AFAIK it's significantly more nuanced. Actually China did support Vietnam in the war - https://en.wikipedia.org/wiki/Vietnam_War#People's_Republic_of_China https://en.wikipedia.org/wiki/Vietnam_War#People's_Republic_... - but invaded Vietnam shortly thereafter, as China was annoyed Vietnam de-throned their darling regime the Khmer Rouge. https://en.wikipedia.org/wiki/Sino-Vietnamese_War https://en.wikipedia.org/wiki/Sino-Vietnamese_War (Meanwhile, the US bombed the shit out of Laos, who barely had any literacy and were essentially bystanders). Vietnam kicked their ass (the Chinese made basically zero progress in taking land, though later declared themselves "victorious", having "taught the Vietnamese a lesson"), but at a cost: many deaths and a legacy of landmines along the remote and mountainous border. The border was only fully demarcated about ten years ago. These days it is better known for people smuggling (mostly young women from Vietnam to China) and drug smuggling (heroin and meth). Factories are moving from China to Vietnam to obtain cheaper labour, and Vietnam's infrastructure has developed substantially, though it is still behind China. In the 1940s the US and Nationalist China were allies - see https://en.wikipedia.org/wiki/The_Hump https://en.wikipedia.org/wiki/The_Hump ... later, the Nationalists fled and and AFAIK Communist China's only major military engagement with the US was in Korea, where US agents descended from McCarthyism tortured Communists on what is now conveniently remade as a holidaying destination. https://en.wikipedia.org/wiki/Korean_War#Chinese_POWs https://en.wikipedia.org/wiki/Korean_War#Chinese_POWs Then there's the French being kicked out, the fact that Ho Chi Minh was French educated himself, evolution in US-French relations and the US takeover of France's former most favoured foreign nation status in Thailand, which was used as a strategic regional base for US military supply. Possible conclusion: It's all a mess, things are never simple in war, humans are sick greedy bastards, and getting over old hatreds stemming from nationalism and past events could be the best thing for the world.