The correct answer is the Battle of Shiloh.
The Battle of Shiloh took place on April 6th and 7th of 1862. This battle took place in Hardin County Tennessee. This was ultimately a Union victory but the casualties on both sides were catastrophic. This was the bloodiest battle in American Civil War history besides the Battle of Antietam.
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By the time World War II ended, most American officials agreed that the best defense against the Soviet threat was a strategy called “containment.” In his famous “Long Telegram,” the diplomat George Kennan (1904-2005) explained the policy: The Soviet Union, he wrote, was “a political force committed fanatically to the belief that with the U.S. there can be no permanent modus vivendi [agreement between parties that disagree].” As a result, America’s only choice was the “long-term, patient but firm and vigilant containment of Russian expansive tendencies.” “It must be the policy of the United States,” he declared before Congress in 1947, “to support free peoples who are resisting attempted subjugation…by outside pressures.” This way of thinking would shape American foreign policy for the next four decades.
C they were devastated by european diseases.
It was factory system assembly because then they had lots of companies that would make weapons for them