Vigilante is a form of the word vigilant, which means "keeping a watchful or close eye on events and people." Sometimes a vigilante will make news for catching a criminal, and sometimes vigilante groups form to target crimes in a bad neighborhood. A common combined use is "vigilante justice," which refers to a form of law-keeping outside of the official channels of police and the courts.
the thirteen colonies that became the USA were originally colonies of Great Britain by the time the American Revolution took place, the citizens of these colonies were beginning to get tired of the British rule.