More than million years ago.But I can not assure the year.
They followed the lines of ancient glaciers. They were defined by large farms and grasslands. They followed the system of rivers, canals, and dams. They were naturally defined by deserts, mountains, and seas.
Yes, the answer to this would be the third option. One of the causes of the rise of the conservative movements in the 1970s is the shifts in the demographics to the suburbs and Sunbelt. Conservative movements are actually rooted from American history. Hope this helps.
