Final answer:
The main cause of the American Revolution was lack of representation. The colonists believed that taxation without representation violated their rights as English subjects.
Step-by-step explanation:
The main cause of the American Revolution was Lack of representation. The colonists were angered by the fact that they were not allowed to elect representatives to the House of Commons, which was imposing taxes on them. They believed that taxation without representation was a violation of their rights as English subjects. The colonists' desire for representation and their objection to being governed without their consent ultimately led to the American Revolution.