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How did Lafayette's trip to France help the American Revolution?

After returning to France, he was a key figure in the French Revolution of 1789 and the July Revolution of 1830. ... In 1781, troops under his command in Virginia blocked forces led by Cornwallis until other American and French forces could position themselves for the decisive Siege of Yorktown

Explanation:

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marquis de Lafayette served the continental army, the American revolution providing tactical leadership while securing vital resources from France

lincoln declared that slavery should not be allowed to spread into the new states, and of course this angered the south at the time.

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