John Eli Whitney Cyrus McCormick and Robert Fulton all made specific contributions to what?

John Eli Whitney, Cyrus McCormick, and Robert Fulton all made significant contributions to the Industrial Revolution in the United States. Whitney is known for his invention of the cotton gin and the development of interchangeable parts, which revolutionized manufacturing. McCormick is recognized for inventing the mechanical reaper, which greatly improved agricultural efficiency. Fulton is celebrated for his advancements in steamboat technology, facilitating transportation and trade along waterways.