And why are all the counties geography square?"
Because early county layouts were based on surveyed sections, especially easy to do, and more so when there are not major rivers, etc.
One mile x one mile= a section, which is 640 acres.
This was a very easy method, and land giveaways were also a part of this, as the west was settled and populated.
Thanks a lot for the explanation.
One learns something new every day.