What are the causes of the revolutionary war? was violence against britain necessary?

The British government decided to make American colonies pay a large share of the war debt from French and Indian war. Through the sugar act,stamp act, and other taxes the British tried to collect taxes.

Jackson  said nullification 'means insurrection and war,' and called it a treasonous attack on america. the second aspect of the  force bill  was the passing in congress of a lower tariff in 1833. this was offered as a compromise to avoid conflict with south carolina, and to attempt to defuse the tense situation.source google

Well all those are true except one that would be that a ballad often features a refrain.