Answer:
E
Step-by-step explanation:
owed a great deal to the mass production of interchangeable parts.
The American system of manufacturing first appeared in the 1800s. the U.S. military had made expansions in the manufacturing methods that were already in existence to produce a newer and more efficient system.
the American manufacturing system was based on
1. the use of interchangeable parts and
2. use of mechanization.
After adopting the use of these two into manufacturing, the military was able to make more products using less resources.