26 Amendment
21 to 18
fight to vote
People that were 18 were sent out to war and they couldn't vote because the voting age was 21
So people started a slogan old enough to fight old enough to vote and got the federal legislation involved.
Problems to law change
It took a group of young activist and their allies to change the law, but each state changed at different times
After protesting and many groups coming together the 26 amendment was formed which stated any body over the age of 18 should not be denied to vote by any state