What evidence is there that colonial protest against the British Parli

What evidence is there that colonial protest against the British Parliament after 1763 was based on principle? What evidence is there that it was based on the economic self-interest of the colonists?

Which to you seems to be the best explanation of colonial motives? Why?

ANSWER
Principle: colonists appealed to their rights as English subjects under the British constitutional system. They willingly undertook economic boycotts of British trade as a means of resistance, even though that entailed sacrifice and financial deprivation on their part.
Economic self-interest: the Proclamation of 1763 threatened colonial land claims; the Sugar Act threatened profits from the illegal West Indies trade; the Tea Act threatened profits of smugglers of Dutch tea and of colonial middlemen.