Why rectangular houses????
Well it seem I need to get on the Cherokee a little more.
Wood is straight!!! some what!
Wood WAS abundant,the Cherokee and Norse built rectangular structures due to the abundance of WOOD.
The northern peoples (Inuit, what-ever, built round houses) even the Kivas of SW America were not angular.
I will add to this post --- I have had another epiphany.
This is a Cherokee lodge house. Smaller, but similar the to the "Long House" of the peoples "across the pond".