during the 1960s, United states were involved in a cold war with the soviet union.
At that time, Vietnam was seen as a proxy that could deepen either the soviet union or united states influence in south east Asia.
The president of the 1960s at that time believe that if we did not send our troops there, the soviet union would take control of the rest of the south east Asian countries. This is why majority of them favor the policies to intervene with the Vietnam government,.
Part of the enormous impact that ancient India have on modern days are, for example, Buddhism, Yoga, the practice of vegetarianism, etc.
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Because of racial oppression.
The source of raw materials for industries comes from agriculture. For example: sugarcane for sugar industry, animal skin for leather industry, etc. Dairy industries also require raw materials that come from agriculture. Oil industries cannot run without oil seeds like mustard, sunflower, soybean, etc.