Why do we care so much about race, nationality, sexual orientation and religious beliefs?

No ones happy with anything if its out of they're comfort zone. If we came from a world when things like that didn't matter. No one would care bout all if that. But since we r livving in societys world its more important. Groups are just a seperation of race that started in biblical times. (If u believe in the bible.) U can read about what happened when a king truest to build a tower to the heavens. It's been like this since bc times since we were born in an imperfect state..