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1921Tulsa Race Massacre
A white mob destroyed Greenwood, Tulsa's prosperous Black district—killing hundreds and leveling homes and businesses. Long minimized in public memory; now widely taught as one of the worst episodes of racial terror in U.S. history.
Updated Mar 21, 2026 1882Chinese Exclusion Act
Federal law barred most Chinese immigration and denied naturalization to Chinese residents—the first major U.S. law restricting immigration by nationality. Repealed in stages; remains a landmark of race-based immigration policy.
Updated Mar 21, 2026 1935Redlining and Racial Covenants: HOLC 'Security Maps' (New Deal Era)
The federal Home Owners' Loan Corporation produced 'Residential Security' maps grading neighborhoods; 'D' areas were often redlined, excluding Black borrowers and shaping decades of segregated wealth. Documented by the Mapping Inequality project and historians.
Updated Mar 21, 2026 2026Tribes Protest Grand Canyon Native History Exhibit Changes
Arizona Republic reported tribal nations protested National Park Service actions targeting Native history exhibits and interpretation at Grand Canyon National Park.
Updated Mar 21, 2026 2026Philadelphia Lawsuit Over President's House Exhibit Removal
Philadelphia officials filed suit over the dismantling of slavery-related exhibits at the President's House site, citing a 2006 city–federal agreement; AP News and local outlets covered the dispute and judicial review.
Updated Mar 21, 2026 2026Big Bend National Park Interpretive Content Reviewed
Big Bend National Park, Texas, was listed among parks where Native-related and climate-related interpretive content faced removal or review under the same federal initiative reported by Arizona Central, Reuters, and others.
Updated Mar 21, 2026 2026Zion National Park: Indigenous and Climate Interpretation Targeted
Zion National Park in Utah was among sites named in coverage of removals or reviews of interpretive material on Indigenous displacement and climate, alongside other Southwest parks.
Updated Mar 21, 2026 2026Federal Review of NPS Signs on Native Mistreatment and Climate
The Washington Post and Reuters reported national parks were directed to review and remove signage on mistreatment of Native Americans and on climate change, affecting many sites across several states.
Updated Mar 21, 2026 2025National Museum of American History: Impeachment Exhibit Revised
Reuters reported the National Museum of American History removed Donald Trump's name from an exhibit on presidential impeachment, restoring an earlier version of the display.
Updated Mar 21, 2026 2025NMAAHC: Major Artifacts Rotated Off Display
NBC News and other outlets reported dozens of objects tied to slavery and civil rights were no longer on public view at the National Museum of African American History and Culture, including items linked to Harriet …
Updated Mar 21, 2026 2025Acadia National Park Climate and Indigenous Educational Signs Removed
Acadia National Park removed educational signs addressing climate change and Indigenous history, part of broader NPS interpretive changes under federal direction. Covered by Vermont Public and regional outlets.
Updated Mar 21, 2026 2026Little Bighorn Battlefield Native American Signage Removed
National Park Service removed or altered Native American–related signage at Little Bighorn Battlefield National Monument; tribal leaders and the Northern Cheyenne Tribal Council opposed changes to markers at the site. Reported by Military Times and others.
Updated Mar 21, 2026 2025Glacier National Park Climate Change Science Removed
Officials removed descriptions and educational materials explaining how climate change is contributing to glacial loss at Glacier National Park.
Updated Mar 21, 2026 2026President's House Slavery Exhibit Removal - Philadelphia
National Park Service workers used crowbars to remove the only federal historic site exhibit commemorating slavery in America — 'The President's House: Freedom and Slavery in the Making of a New Nation.'
Updated Mar 21, 2026 2025Stonewall National Monument LGBTQ+ History Altered
Trump administration removed and altered references to transgender and queer people at Stonewall National Monument — the birthplace of the modern LGBTQ+ rights movement.
Updated Mar 21, 2026 2025Muir Woods 'History Under Construction' Exhibit Removal
Trump administration removed 'History Under Construction' exhibit acknowledging Coast Miwok Indigenous history and the racist roots of conservation movements at Muir Woods National Monument.
Updated Mar 21, 2026 2025Executive Order 14253: 'Restoring Truth and Sanity to American History'
President Trump signed Executive Order 14253 directing the Department of the Interior and National Park Service to remove exhibits about slavery, Indigenous genocide, civil rights, and climate science from national parks and federal lands.
Updated Mar 21, 2026 2025Grand Canyon Indigenous Displacement References Removed
National Park Service removed signs and exhibits referencing the forced displacement of Native Americans from Grand Canyon region when the National Park was created.
Updated Mar 21, 2026