How did Samuel Morse’s best-known innovation contribute to U. S. growth and development

It increased national unity by reducing sectional differences. It boosted the speed of cross-country mail delivery.

Explanation:

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- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.