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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 Townshend Acts first involved the old Navigation Laws. Burke did not oppose these laws, as he had the others introduced by Townshend, because he did not feel that the colonies would protest against the Navigation Laws. They were  traditional commercial regulations.