The change happened overnight into Wednesday.
Workers have begun restoring the displays about slavery at the President's House site in Philadelphia.
The Trump administration was sued over National Park Service policies that the groups say erase history and science from America's national parks.
The Underground Railroad was a secret pathway to freedom for enslaved people escaping north, through woods, tunnels, private homes, under floorboards, inside churches and even hidden beneath wagons.
February is Black History Month, a time the country highlights and celebrates the accomplishments of Black Americans. And the fact that Black history is part of America's history is important for all Americans to know, learn about, and understand.
A federal judge ordered the Trump administration to mitigate further "damage" to the slavery exhibit panels that NPS removed from the President's House in Philadelphia.