Large Crowds Expected Across The U.S. For 'March For Our Lives'

In the wake of even more mass shootings, specifically those in Buffalo and Uvalde, March For Our Lives is rallying again.

In the wake of mass shootings, for the second time March For Our Lives is hosting a day of action in Washington, D.C., with events in 450 cities across the world.

The youth-led movement started more than four years ago, after a gunman killed 17 student and staff at Marjory Stoneman Douglas High School in Parkland, FL.

In the immediate aftermath, through grief and shock, students at the school started to demand change. Viral videos, interviews and walkouts quickly grew into a nationwide movement with a rally in D.C. and marches across the country as youth pushed for gun legislation, called March For Our Lives.