In the summer of 1965, support for the conflict in Vietnam eroded as President Lyndon B. Johnson’s advisors recommended sending hundreds of thousands of servicemen over the course of at least five years to win the war. Troop buildup grew steadily, and on July 28, Johnson ordered the number of ground forces to increase to 125,000 and doubled the number drafted into the military, from 17,000 a month to 35,000.
As more and more young American men were drafted to fight, a new single, "Eve of Destruction" by Barry McGuire, hit the airwaves and drove home a key point of anger in its opening lyrics: Why should men be old enough to be drafted into war and not even old enough to vote?
_The eastern world it is explodin'__Violence flarin', bullets loadin'_You're old enough to kill but not for votin'
Released on July 21, 1965, "Eve of Destruction" entered the Billboard charts at #103; by September 25, it had reached #1. In Washington, the government prepared to cap the number of soldiers at 195,000—and young Americans were weeks away from burning their draft cards. The stark realities of the war—and the fear of being drafted—energized a campaign to lower the voting age from 21 to 18.
"You're old enough to kill but not for votin'" was reflected in anti-war protests as "Old Enough to Fight, Old Enough to Vote"—a rallying cry against the draft and for the right of draftees to have some say in their fate. In 1965, 130,991 young men were inducted in the military service; a year later, the number ballooned to 382,010. Many of them were ages 18-20, and thus legally prohibited from voting.
But while the issue burned hotter in the Vietnam era and ultimately led to change, the battle to lower the legal voting age was hardly new.