Why is the Navigation Act in 1660 considered the most important piece of imperial legislation drafted before the American Revolution?

Question

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The Navigation Act of 1660 greatly strengthened the English mercantile empire by stipulating that goods imported into England or the colonies must be transported on English ships and sold in English markets. This ensured that England would have a monopoly on colonial trade and helped establish England as the dominant colonial power of the era.

Why Is the Navigation Act in 1660 Considered the Most