Population and income and resource gradients, migration and conflicts
Across the Globe: Why 50% of The World Live in these 6 OVERCROWDED Countries at https://www.youtube.com/watch?v=rlw3kkAU1Ps You might try to classify land area according to whether it can support humans. But, with intensified agriculture and imports, large cities with still higher densities are common. Also, take a look at population density gradients between countries, and
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