The right answers are " institution of the draft
" and "increasing body count
".
I imagine you are referring to the Vietnam War, well, at that time the anti-war movement was growing in the United States with constant manifestations and the growth of many institutions of pacifist projects. Nixon appealed to the silent majority of Americans in support of the war. However, the revelations of the massacre of civilians, women and children mainly in the village of My Lai provoked a national and international uprising, increasing the pressure for peace.
If you remember newspapers were how many people envied war and how many thought that the British soldiers did wrong in the Boston Massacre where both sides were at fault.