It was called the Second New Deal
President Kennedy relied on the policy of brinkmanship as he allowed the situations to escalate to the verge of going into war without actually going into war in order to coerce the Soviet Union to back down. Given that both countries had the capability to completely destroy the other, this strategy was ideal by the idea of Mutually Assured Destruction as neither countries were willing to start war
Henry Ford created the assembly line that allowed him to make cars more available to Americans for a lower cost
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The answer in the question is letter C.
In the naval warfare during the American Civil War, both the Confederate and Union military developed ironclads. It was a fight between the Confederacy and the Union which changed the naval warfare's foundation using the first ironclads and submarines.