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It has very high population density. The map of accessibility closely mirrors a [population density map](http://www.worldometers.info/img/world_population_density.gif). Most of the interior of Africa, Latin America, the Middle East, and Central Asia was (and mostly still is) sparsely inhabited because it is uninhabitable deserts, mountains, and rain-forests, with most of the population living near the coasts.
One major exception is Eastern China which would definitely be all white today, but had lots of blue in 1950. China was having a very rough time in 1950. There would be a lot more white in Africa and Southeast Asia and many other regions, but a lot of the area would still be blue for the same reason that most of Australia, Canada, and Russia are blue.