1) The draft: Many Americans were opposed to the draft, which they felt was unfair and forced young men to fight in a war they didn't believe in.
2) Media coverage: The Vietnam War was the first war to be televised, and the graphic images of violence and death shown on TV caused many Americans to question the morality of the war.
3) Anti-war protests: The anti-war movement grew in the late 1960s, with many Americans taking to the streets to protest against the war. This led to clashes with police and a sense of division between those who supported and opposed the war.
4) Casualties and cost: The high number of American casualties and the rising cost of the war also contributed to division among Americans, with many questioning whether the war was worth the human and financial toll it was taking.