In a historic groundswell of youth activism, hundreds of thousands of teenagers and their supporters rallied across the U.S. against gun violence Saturday, vowing to transform fear and grief into a “vote-them-out” movement and tougher laws against weapons and ammo.

They took to the streets of the nation’s capital and such cities as Boston, New York, Chicago, Houston, Minneapolis, Phoenix, Los Angeles and Oakland, California, in the kind of numbers seen during the Vietnam era, sweeping up activists long frustrated by stalemate in the gun debate and bringing in lots of new, young voices.

This gallery was curated by Donald King and Patrick Sison in New York.

Text from the AP news story, ‘Vote them out!’: Hundreds of thousands demand gun control, by Ashraf Khalil and Calvin Woodward.