WATCH: The Students We Met ‘Marching For Their Lives’ in Washington, D.C.

The estimated 800,000 protesters who packed a three-quarter-mile section of Pennsylvania Avenue between Capitol Hill and the White House on Saturday made March for Our Lives, a colossal effort led by Marjory Stoneman Douglas High School students to advocate for gun-control legislation, one of the biggest youth protests in the U.S. since the Vietnam era — and the largest single-day demonstration in Washington history. Lucinda Shen and Emmeline Zhao joined the march to meet the students leading the spectacle. Here are some of the many voices we encountered last weekend, talking about why they were marching — and what they hope will happen next.

—Video produced by Lucinda Shen & Emmeline Zhao; Edited by James Fields