The colonists' objection to "internal" taxes did not mean that they would accept "external" taxes; the colonial position was that any tax laid by Parliament for the purpose of raising revenue was unconstitutional. "Townshend's mistaken belief that Americans regarded internal taxes as unconstitutional and external taxes constitutional", wrote historian John Phillip Reid, "was of vital importance in the history of events leading to the Revolution." The Townshend Revenue Act received the royal assent on 29 June 1767. There was little opposition expressed in Parliament at the time. "Never could a fateful measure have had a more quiet passage", wrote historian Peter Thomas.