Many factors contributed to this decision, however taxes they thought of unjust and denial of westward expansion are some of the most prevalent reasonings for the decision to do so.
The Colonists wanted independence from Great Britain because the king created unreasonable taxes, those taxes were created because Britain just fought the French and Indians. England decided that since they fought on American soil, then it was only fair to make Colonists pay for it.
A government has various institutions which deal with specific matters.... So, in this case it is the Judiciary which resolves conflicts between people, groups or countries (UN)
