Have you ever considered what it means to be a citizen? From the 19th century, more and more civil rights. Unfortunately not everyone.
For love for the own nationality and consequent striving to promote the identity of one's own country and to stress. Nationalism is usually accompanied by a certain superior aversion to the strange.
Follow your politics? It is sometimes very complicated. There are many currents with a different view. This arose in the epoch of the 19th century.