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Bolded Info:The Navigation Laws were the most famous of the laws to enforce mercantilism. The first of these was enacted in 1650, and was aimed at rival Dutch shippers who were elbowing their way into the American carrying trade. The Navigation Laws restricted commerce from the colonies to England (and back) to only English ships, and none other.
The purpose of the Townshend Acts was to raise revenue in the colonies to pay the salaries of governors and judges so that they would remain loyal to Great Britain, to create a more effective means of enforcing compliance with trade regulations, to punish the province of New York for failing to comply with the 1765 Quartering Act, and to establish the precedent that the British Parliament had the right to tax the colonies.