You're probably underage and never went outside if you never saw a border.
They exist, and have existed for centuries. You're about to discover why they are needed.
Discussion
borders divide. that's the only thing they're good for. At the end of the day we're all just people.
Yeah, go anywhere in Africa without defending your perimeter/border and then let me know how it went.
You won't value the existence of borders while you are living comfortably inside one of the good countries.
First world privilege I guess.