Nationalism is an invented tradition, it did not become a prominent ideology until the end of the 18th century and it came about following the revolutions against the tyranny of absolutism.
In contrast with the subjection to autocrats (masters, monarchs, religious leaders), people started to identify with imagined communities aiming to share both culture and power.

The first big wave of deterioration in Europe after the institution of national states was the rise of Nazi Fascism and related dictatorships.

The UN and the Universal Declaration of Human Rights were important steps in the movement toward…