Final answer:
Eli Whitney invented both the cotton gin and interchangeable parts, which revolutionized the cotton industry and manufacturing processes.
Step-by-step explanation:
The cotton gin was invented by Eli Whitney in 1793. It was a machine that revolutionized the cotton industry by automating the process of removing seeds from cotton fibers, greatly increasing the efficiency of cotton production.
Interchangeable parts were also introduced by Eli Whitney. He developed the concept of manufacturing components that are identical and can be easily substituted for one another, making the assembly and repair of machines more efficient.
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