There is very little water. Due to that animals were not as populated nor were humans in that area.
Isolationist because they had no intentions on joining the war before pearl harbor
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Earth's mass has remained constant, and thus the gravitational pull at the surface has decreased over time; Earth's mass has grown with the volume in such a way that the surface gravity has remained constant; Earth's gravity at its surface has increased over time, in line with its hypothesized growing mass and volume.