They bowed their heads in honor of the dead. They carried signs with messages like "Never again" and "Am I next?" They railed against the National Rifle Association and the politicians who support it.
And over and over, they repeated the message: Enough is enough.
In a wave of protests one historian called the largest of its kind in American history, tens of thousands of students walked out of their classrooms Wednesday to demand action on gun violence and school safety.
The demonstrations extended from Maine to Hawaii as students joined the youth-led surge of activism set off by the Feb. 14 massacre at Marjory Stoneman Douglas High School in...