Geography & time
History has a
geography.
Every policy, migration, and act of resistance happened somewhere. Maps and timelines make the spatial and temporal dimensions of the chain visible — showing how place shaped consequence.
7 Influential African Empires
From 1070 BCE to 1897 CE — the civilizations that existed before and during the slave trade, and what was deliberately destroyed to make it possible.
The Transatlantic Slave Trade Routes
12.5 million people forcibly removed across the Atlantic, 1441–1808. The routes that built the modern world's wealth.
Acts of Resistance — 11 Major Revolts, 1712–1841
Enslaved people never stopped fighting for their freedom. From New York City to the Haitian mountains, from Virginia tobacco fields to the Atlantic Ocean — documented revolts, conspiracies, and acts of collective resistance across 130 years.
Organized Self-Defense — A Geography of Black Resistance, 1919–1966
From the African Blood Brotherhood after the Red Summer to the Black Panthers in Oakland — organized armed self-defense was a continuous, documented tradition. The Second Amendment was originally used against Black people. Black communities picked it up and used it back.
The Abolition Network — Underground Railroad & the Black Press, 1829–1865
David Walker smuggled pamphlets in sailors' coats. Harriet Tubman made 13 missions and never lost a passenger. Frederick Douglass ran a newspaper out of Rochester. The abolitionist movement was a network — of routes, printing presses, safe houses, and radical texts — before it was a war.
The Flooded City — Five Ways Black Communities Were Displaced, 1898–Present
The same neighborhoods, taken five different ways: mob destruction, federal bulldozers, highway construction, literal flooding, and gentrification. Every mechanism had government involvement. The map is a national pattern, not a series of local accidents.
HOLC Redlining — The Maps That Still Shape America
From 1933–1968, the Home Owners' Loan Corporation graded every American neighborhood A–D by race. Grade D = "Hazardous" = Black. Select a city to explore the original zone boundaries and their present-day consequences.
More visualizations
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Spatial histories of migration, policy, and resistance — each connected to a causal thread.
The Abolition Network & Underground Railroad
Walker's pamphlets smuggled in sailors' coats. Tubman's 13 missions north. Douglass's North Star printing press in Rochester. The movement that preceded the war by 32 years.
● AvailableThe Great Migration
Six million Black Americans moved north and west — and were met by redlined cities.
● AvailableAfrican Kingdoms at Their Peak
The territorial reach of Mali, Songhai, Kush, Aksum, and Benin before the disruption of the slave trade.
● AvailableRedlining & Life Expectancy
Former Grade D neighborhoods have life expectancies up to 20 years shorter than former Grade A neighborhoods in the same city.
In developmentReconstruction Military Districts
The five military districts imposed on the South after the Civil War — and what happened to Black political power when federal troops withdrew in 1877.
In developmentRacial Terror Lynchings
EJI documented 4,084 racial terror lynchings in the South between 1877 and 1950. Geography of terror mapped to geography of political suppression.
In developmentThe Racial Wealth Gap by Geography
Median Black household wealth: $24,100. White: $188,200. The gap is widest in cities with the most severe HOLC redlining.
In developmentThe Flooded City — National Displacement Map
Mob violence, urban renewal, highways, Katrina, gentrification. Five mechanisms across 125 years — the same neighborhoods, taken again and again.
● AvailableActs of Resistance & Revolt
From New York to New Orleans to Haiti — 11 major documented revolts, plus hundreds of smaller acts. Enslaved people never stopped fighting for freedom.
● AvailableThe Haitian Revolution & Its Punishment
The only successful slave revolution in history — then isolated, embargoed, and forced to pay France $21 billion (equivalent) until 1947 for the "crime" of freedom.
In developmentStory Map · Interactive
The Great Migration — 6 Million People, 6 Cities
Between 1910 and 1970, six million Black Americans left the South. They didn't flee randomly — they followed specific routes to specific cities, driven by specific recruiters, newspapers, and networks. Scroll through each destination to follow the chain.
The South — Why They Left
After Reconstruction ended in 1877, Southern states systematically destroyed Black political power. By 1900 the infrastructure was complete: Black Codes replaced by vagrancy laws, convict leasing replacing slavery, lynching replacing formal enforcement. Between 1877 and 1950, 4,084 lynchings were documented in the South. The boll weevil destroyed cotton crops starting in 1915. World War I created labor shortages in Northern industry. The Defender and the NAACP began recruitment. The conditions for the largest domestic migration in American history were set.
Chicago, Illinois
The Illinois Central Railroad ran direct from Mississippi and Louisiana to Chicago. The Chicago Defender — the most widely read Black newspaper in America — was passed hand-to-hand across the South and explicitly encouraged migration. Robert Abbott's paper printed train schedules alongside stories of Chicago wages. Chicago's Black population grew from 44,000 (1910) to 278,000 (1940). The South Side's Black Belt became Bronzeville — a city within a city, generating the Chicago Blues, the policy wheel, and the Democratic machine bloc that would reshape national politics.
Detroit, Michigan
Henry Ford's $5-a-day wage in 1914 was double the national average and explicitly available to Black workers — a radical policy for its era, driven partly by the labor shortage of WWI. Ford had a specific labor pipeline: recruiters working through Black churches in Alabama and Georgia. Detroit's Black population grew from 5,700 (1910) to 300,000 (1950). What Ford gave with one hand, the city took with the other: restrictive covenants confined Black residents to Paradise Valley and the near east side, creating the conditions for the 1943 race riot and ultimately the 1967 uprising.
New York City — Harlem
Harlem's transformation into a Black neighborhood began before the Great Migration — real estate speculators overbuilt, prices collapsed, and Black realtor Philip Payton convinced white landlords to rent to Black tenants who would pay premium rents. By the time the Migration accelerated, Harlem was ready. New York's Black population grew from 91,000 (1910) to 458,000 (1940). The concentration of talent, capital, and institutions produced the Harlem Renaissance — Langston Hughes, Zora Neale Hurston, Duke Ellington, Marcus Garvey's UNIA. The intellectual and cultural infrastructure that would sustain the civil rights movement for fifty years was built in Harlem between 1920 and 1935.
Los Angeles, California
The Second Wave (1940–1970) was driven by WWII defense industry jobs. Los Angeles' Black population grew explosively — but the city used restrictive covenants, redlining, and highway construction to confine Black residents to South Central. LA's Black population grew from 63,000 (1940) to 464,000 (1970). The Watts neighborhood — which had been majority white in 1940 — was majority Black by 1960 after white residents used racially restrictive covenants to exclude Black buyers everywhere else in the city. Watts burned in 1965. The McCone Commission that investigated the uprising described "the dull, devastating spiral of failure" — and recommended nothing that changed the structural conditions.
Philadelphia, Pennsylvania
Philadelphia already had a significant free Black community before the Migration — it was the headquarters of the AME Church, W.E.B. Du Bois' research site for The Philadelphia Negro (1899), and home to the oldest Black newspaper, Freedom's Journal. The Migration transformed it. Philadelphia's Black population grew from 84,000 (1910) to 529,000 (1970). The concentrated poverty in North Philadelphia — created by redlining, deindustrialization, and targeted policing — produced both the MOVE organization and the city government that dropped a bomb on it in 1985. The 1985 MOVE bombing is the only instance of a U.S. government dropping an incendiary device on a civilian neighborhood in peacetime.
The Return — The New South Migration
Since 2000, demographers have documented a reversal: Black Americans are leaving Northern cities and returning to the South — Atlanta, Houston, Charlotte, Raleigh. The drivers are the same as in 1915, inverted: Southern cities now offer cheaper housing, growing economies, and Black political infrastructure built by the original Great Migration generation. Between 2000 and 2010, the Black population of Atlanta grew by 40%; Chicago's fell. The neighborhoods that the Great Migration built — Bronzeville, Harlem, South Central, North Philadelphia — are now undergoing gentrification that is displacing the descendants of the migrants who built them. The chain continues.