Fun fact: in 1950, there were only 500 million people in China. That means that Mao killed half the population of China. That's a little less than the raw percentage of population loss from the native population of North America in the 19th century (~600k in 1800 to 250k in 1890). Funnily enough, in 1979, the population of China had nearly doubled from the 1950 figures.
I guess we'll never know what happened in North America, but that Mao guy sure was evil.