the oldest trick in the book

The oldest and most effective way to control mass groups of people is by making them feel that they're better than anyone not affiliated. Religion once had a monopoly on making people feel better then others thus controlling perception of who's evil or not ... but since the rise of nation-states nationalism is now tha blaring trumpet. Anyone who's fighting on planet Earth believes they're better than their enemy, closer to God, opposite of evil blah blah blah blah blah . Never do they ask themselves... why do I believe this? who told me this and why should I trust them? The most non offensive example I can give is intercity gangs culture. Why do they fight with each other? They're exactly the same economically, education etc. why do gang members see themselves as being different? People who promote divisive separation are the only enemy to Planet Earth and human civilization. The poor workers of the Earth fight for territory while the wealthy and educated are building societies in Space...