China has 20 times the land area and 35 times the population of California, and you're comparing apples to oranges comparing a nation-state entity with a sub-nation-state entity that was stymied by conflict with the superior government. And you are comparing actual construction time in China with something else in California (but what, I'm not sure, because 10 years is too short if you are looking at it from public project initial very-partial financing approval with Prop 1A, and too long of you are looking at start of construction in 2015.)