The American colonists considered themselves loyal Englishmen to a man, but when they began to enjoy unequalled prosperity by printing and circulating their own Colonial scrip, the stockholders of the Bank of England went to George III and informed him that their monopoly of interest-bearing notes in the colonies was at stake. He banned the scrip, with the result that there was an immediate depression in the commercial life of the Americas.
This was the cause of the Rebellion; as Benjamin Franklin pointed out, the little tax on tea, amounting to about a dollar a year per American family, could have been borne, but the colonists could not survive the banning of their own money… via the tap.