Answer:
Interchangeable parts, popularized in America when Eli Whitney used them to assemble muskets in the first years of the 19th century, allowed relatively unskilled workers to produce large numbers of weapons quickly and at lower cost, and made repair and replacement of parts infinitely easier.
Explanation:
<span>1.frustrating situation in Southeast Asia.
2.rising resentment at home to the war in Vietnam.
3.increasing drug addiction and alcoholism.
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