I wouldn't give the credit of the achievement to CPC.
I think it boils down to 1 factor: Chinese High average IQ.
No troll, seriously, it is because that it's not an "accident", a "coinstance" or a "random event" that China just happend to have built relatively good infrastructures so quickly.
Firstly if it's not an "accident", then it must be due to something deliberately planned and executed out of sheer determination, right? These depend on IQ level of the society involved, as low IQ societies such as some African countries can't get it executed even with ready available blueprints while sitting on tons of diamond mines.
Secondly, the infrastructure can not be done by an individual or a small group or groups, but more by a society at large in fact: from strategists (think tanks), decision makers, planners, to engineers, designers, manufactruers and labours, etc. It again proves that it is not "an accident', but a result of a conscious and collective behaviour.
But why this behaviour boils down to inate abilities such as high IQ?
OK, people say it's due to hard work, nationalitic ppl, sacrifice, focus, good planning, CCP policy, finance available, etc. Yet these factors are all determined by the corresponding inate ability of IQ eventually.
Through time, high IQ societies have been capable of building highly attractive cultures together with a set of time-proven values; with high cultures and values come naturally some desirable cultural traits such as focus, discipline, hard work, sacrifice..AND people naturally become nationalistic - nothing but being attracted to their own culture.
High IQ societies usually have good planning with clear priorities which include govt policies (regardless the characteristics of govts, dictatorship or democratic), etc. With time a society of high IQ people are able to gather finance and resources needed, overcome red tapes, figure out how to get it done in time and on budget, in spite of some coruptions.
CCP alone , or dictatorship alone, can't do it. There're many disctatorships in the world, which has it done like China did and is doing?
My answer therefore is:
high IQ.