Answer:
war
Explanation:
they needed guns and supplies for the soldiers
communication...: people could ask for a certain product
transportation...: get supplies easier for making stuff
mass...: they could make large quantities of stuff faster
They required guns and supplies for the soldiers because of the war, people may request a specific product through communication, transportation could access supplies for producing things more easily, and mass production could produce enormous amounts of goods more quickly.
War: Gunsmiths made it easier for soldiers to obtain the weapons and equipment they needed to fight.
Communication advancements: The telephone enabled individuals to ask for a specific person and speak with them practically quickly.
Transportation advancements: Cars and boats allowed humans to access supplies for producing things more quickly.
Mass production: Factories made it possible to produce enormous quantities of goods in a short period of time.
For more information about American production, refer below
https://brainly.com/question/8008691
