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Answered

Which of these innovations led to increased production in American factories in the early 1800s?
the invention of the mechanical reaper
the use of interchangeable parts
the availability of electricity
the construction of canals



Answer :

Here your answer is the use of interchangeable parts. These became popular because they allowed people to repair and replace parts much easier. 

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The correct option is: "the use of interchangeable parts"

The interchangeable pieces are part of a basic concept that consists in creating identical or almost identical pieces to be used in a chain production. These pieces can be assembled making a set to form a finished final product. For example, cars, computers, furniture, practically all the products that are used today, are made of interchangeable parts. In the USA Eli Whitney was the first to use interchangeable parts in the manufacture of firearms.