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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.
Up to 1651 Dutch merchants could also trade with New England and Virginia as well as New Netherland. However once the British instituted the Navigation Act of 1651, non English ships were no longer allowed to transport goods from English ports.