By the end of the American Revolution which states had taken steps to end slavery?

To be honest the US was one of the last states to end slavery so after that revolution it was only the US

In New England, the brave military service of African Americans and the revolutionary spirit almost instantly ended slavery. From 1780 to 1804, the Middle States of New York, Pennsylvania, and New Jersey pursued policies of gradual emancipation.

Explanation:

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on december 1, 1774, the continental association was created to boycott all contact with british goods. by reversing the economic sanctions placed on the colonists, the delegates hoped britain would repeal its intolerable acts.

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