National Pride
Universal values
Sense of belonging
Collective action

A legitimate government derives from the consent of the governed.
“Given a multitude of rational beings requiring universal laws for their preservation, but each of whom is secretly inclined to exempt himself from them, to establish a constitution in such a way that, although their private intentions conflict, they check each other, with the result that their public conduct is the same as if they had no such intentions.” – Immanuel Kant