>>2673180>tl:dr - Climate, weather, topography, and biogeography are more complex than one assumes.They are complex yes. I did not assume, though. I spoke generally about an entire region and am well aware that within that region there are local differences. Maybe continue reading the thread before you assume what I've assumed.
And you can see that the light pollution map confirms the "general" aridity zone west of the 100th meridian. Population spread in the US was not based on school-teaching about climate, it was based on hard realities facing settlers like access to potable water.