Answer:
USA did make many bombing campaigns against North Vietnam, which only alienated the population but could not degrade the fighting force of the Vietcong. ... Support of China /USSR: One of the most crucial reasons for the defeat of the USA was the unflinching support of China and the Soviet Union to the North Vietnam.
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It made the country fear what they would do next without they're president. It made people feel unsafe and scared. - if wrong sorry