As the U.S. prepares to celebrate its 250th anniversary, former national park rangers are hosting teach-ins and sharing history that the Trump administration has sought to erase from federal land.

n.prTrump axed a Black history exhibit. Former park rangers are teaching it anyway.As the U.S. prepares to celebrate its 250th anniversary, former national park rangers are hosting teach-ins and sharing history that the Trump administration has sought to erase from federal land.