Singer Alicia Keys and actress America Ferrera, speaking at the rally in Washington, DC, read letters from a mother and grandfather who were separated from their children.
Keys brought her 7-year-old son Egypt to the march and shared her frustration over family separations. She read a letter from a mother whose son is being held in a facility in Oregon.
"I couldn't even imagine not being able to find him," she said. "I couldn't imagine being separated from him or scared about how he is being treated. So this is all of our fight. Because if it can happen to any child, it can happen to my child and your child and all of our children."
Ferrera, whose parents are Honduran immigrants, read the story of a grandfather who is hoping to be reunited with his granddaughter. She encouraged the crowd to listen to his words and imagine themselves in his situation.
"This fight does not belong to one group of people, one color of people, one race of people, one gender. It belongs to all of us," she said. "What makes humans remarkable is our capacity to imagine. We have an imagination. Let's use it."