Answer:
D. Religious principles and beliefs.
Explanation:
The leader of a theocratic is typically considered divinely inspired and is often a member a a form of clergy.
First off why is this Geography. I am going to yolo this and say segregation was unconstitutional. <span />
I think this would be the Great Wall of China!
although it's actually thought to be much, much longer: over 5000 miles long, if yoiu include natural defensive barriers used in it.