Obama also said he hoped the museum would help people bridge divides that were re-exposed by the latest fatal, police-involved shootings of black men.
The country's first black president, Obama was scheduled to preside over an outdoor ribbon-cutting ceremony Saturday morning for the National Museum of African American History and Culture, which was built on the National Mall in the shadow of the Washington Monument.
He added that the museum has plenty of space to feature black icons like Harriet Tubman, Martin Luther King Jr, Muhammad Ali and others.
"What makes the museum so powerful and so visceral is that it's the story of all of us, the folks whose names you never heard of, but whose contributions, day after day, decade after decade, combined to push us forward and the entire nation forward," Obama said, mentioning maids, porters and others who stood up for themselves despite daily assaults on their dignity.
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Civil rights legends like Rep John Lewis, D-Ga, and Jesse Jackson attended, along with representatives of a new generation of activists, including DeRay Mckesson of the Black Lives Matter movement.
Everyone in the room can think of an unsung hero, Obama said. "But the point is that all of us cannot forget that the only reason that we're standing here is because somebody, somewhere stood up for us," he said. "Stood up when it was risky. Stood up when it was not popular. And somehow, standing up together, managed to change the world."
"My hope is that, as people are seeing what's happened in Tulsa or Charlotte on television, and perhaps are less familiar with not only the history of the African-American experience but also how recent some of these challenges have been, upon visiting the museum, may step back and say: 'I understand. I sympathise. I empathise. I can see why folks might feel angry and I want to be part of the solution as opposed to resisting change,'" the president said.