航海条例
In the 1760s the London government raised small sums by new taxes on the colonies. This occasioned an enormous uproar, from which historians date the origins of the American Revolution. The issue was not the amount of the taxes—they were quite small—but rather the constitutional authority of Parliament versus the colonial assemblies to vote taxes. New taxes included the Sugar Act of 1764, the Stamp Act of 1765 and taxes on tea and other colonial imports. Historians have debated back and forth about the cost imposed by the Navigation Acts, which were less visible and rarely complained about. However, by 1795, the consensus view among economic historians and economists was that the "costs imposed on [American] colonists by the trade restrictions of the Navigation Acts were small."