Border Walls Divide
I think border walls divide because they separate nations, cultures, traditions, etc. There are also to types of borders mental and physical borders. A physical border that separates nations is the border wall between north and south Korea, North Korea is ran on dictatorship and South Korea is the complete opposite. If somebody moves somewhere new they could be judged or looked at differently because of the borders placed on learning about other cultures. Which then impacts that person mentally and causes them to build their own wall inside their mind.