What is the relationship between nationalism and revolution?

Answer 1

Broadly, nationalism created new social groups that transcended traditional religious, cultural, or socio-economic factions and that, in turn, created demand for new political institutions to represent these new groups. When the new groups were unable to be represented, for a variety of reasons (e.g.) they lived in multiple states or were minorities in their states) they could sometimes only resort to violence as a means to make their demands heard. Additionally, sometimes nationalism supported other causes, as occurred in some of the Revolutions of 1848.

Answer 2

emerged out of the necessity to unite in order to win the war