Final answer:
The Haitian Revolution was the most revolutionary among the American, French, and Haitian revolutions as it challenged and abolished the institution of slavery.
Step-by-step explanation:
The Haitian Revolution was the most revolutionary among the American, French, and Haitian revolutions. Unlike the American and French revolutions, the Haitian Revolution challenged and ultimately abolished the institution of slavery, making it the first sustained and successful challenge to slavery in the Atlantic world. The revolution resulted in widespread radical change and the creation of the new nation of Haiti, making it the most transformative and radical revolution of the three