The communist victory in China marks a significant chapter in the modern history of the country.
The communists were lead by Mao while the nationalists were led by Chiang Kai-shek.
The 4 reasons due to which the communists won are:
1. Chiang's policies of oppression and violence did not help him get widespread support
2. Chiang was supported by the Americans, but the support eventually weakened
3. The message of the communists resonated with the poor farmers and the peasant class, which Chiang failed to engaged.
4. Mao was able to get some form of support, albeit limited, from the Soviet Union
If you're asking in general then, the area has to have people who share common customs, belief and language.However, this might not entirely be true as there are some countries which have vast diversity and still portray nationalism.
Hope this helps!!
I would say that it's B because it appears that the shape of Han China is based off of trade routes.
Increase in efficiency of farming and also resulting in fewer and also got large farms.
