Both china and russia have heavily concentrated populations compared to the US, you can see this readily from a map of either's rail system. When you compare these to the population heatmaps it's extremely obvious.
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Now compare that to the US
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Wait, I can hear you typing, thinking that you're incredibly clever for noticing that the US ALSO has population centers, and how that invalidates my point. Before you hit the reply button, I want you to look at the distribution of the population centers in the US compared to the two previous examples. Yes, The US has concentrations, that's true of any distribution of people, but the US has widely distributed concentrations across its entire landmass rather than clusters of them.
You are a fucking idiot and you should stop having opinions.