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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.
With this act, the colonists' anger reached the boiling point. The frustration was now to take the form of overt rebellion. The previous Molasses Act, Navigation Acts, and Sugar Act suddenly were seen as an ominous prelude to this final blow, the enslavement of British subjects by their own British government.