That pushes the issue back into the older question, given a nation's worth of people, what type of dividing lines best group them into sub-populations for the p

That pushes the issue back into the older question, given a nation's worth of people, what type of dividing lines best group them into sub-populations for the purpose of representation. That is, why lines in space vs lines in income, or total wealth, or hair color, or profession? And what defense of lines in space could possibly defend such complex (gerrymandered) ones?