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Answer:
A. Technological advancements made during the war helped create
new products for people to buy.
Explanation:
After World War 1, the advancement of weapons began. Telephones were also introduced because the first edition of the "telephone" was used as a form communication for soldiers in the trenches. Vehicles were further developed and modernized not only for soldiers but for consumers. Cars were made more available to regular Americans, meaning more cars were mass produced and improved.