The Heart of Industry!
About the invention
Interchangeable parts were originally made for muskets in the U.S military. This was important because people could change individual broken parts of a product without having to throw out the whole thing. The invention of interchangeable parts is still used and is very popular today.
Interchangeable parts affected the world by making the repair of broken products extremely quick and easy. It made the production of good faster and work life easier.