The Blood Geography of America

This article draws on publicly available federal records, peer-reviewed demographic research, and genealogical archives to examine a specific question: which non-Indigenous population groups have maintained the longest continuous documented presence in the United States, and how do their growth histories compare across time.

The data sources used here are primary government documents. The U.S. Census Bureau decennial records, Freedmen's Bureau registers, USCIS immigration statistics, and the slave schedules of 1860 contain population figures that are not estimates or projections. They are enumerated counts, available for independent review at archives.gov and census.gov. What follows is an organization of what those records show.

In 1607, English settlers established the first permanent colony at Jamestown, Virginia. In 1619, the first documented Africans arrived at Point Comfort, Virginia. These two arrival events, twelve years apart, established the two founding-era non-Indigenous population groups in what would become the United States. Both populations were small. Both were concentrated in the same geographic region along the eastern seaboard and the rivers running south and west from the Chesapeake.

What happened next is the central fact of this analysis. The African-origin population grew through continued forced migration over the following 189 years. Then, on January 1, 1808, the Act Prohibiting Importation of Slaves (Statutes at Large, 2:426) took legal effect, closing the international slave trade. From that date forward, the Black American population grew entirely from within. No new arrivals. No outside influx. Only generations accumulating on American soil for the 57 years remaining until Emancipation, and in every generation since.

That closure date is the key variable in this analysis. It means that by 1865, the Black American population had been a closed, internally growing group for 57 years. By 1880, it had been growing from within for 72 years. By 1920, 112 years. The population counted in the 2020 census as Black or African American descends overwhelmingly from people who were already here before the Ellis Island era began.

European immigration followed a different arc entirely. USCIS historical records document the arrival of several million German and Irish immigrants between 1840 and 1880. The Ellis Island period from 1880 to 1924 brought millions more from Southern and Eastern Europe. These arrivals expanded the population enumerated as white. They were not, for the most part, descended from the original English colonial settlers of the 1600s. They were new arrivals, and they arrived after the Black American population had already been growing in place for generations.

The two charts below present this history in visual form. The first shows raw population counts for the two founding-era groups from 1607 through 1870. The numbers come from the U.S. Census Bureau and from Campbell Gibson's peer-reviewed demographic study of historical census data (Working Paper No. 56, 2002). By approximately 1790, the Black American population had already surpassed the original English colonial count. By 1810, Black Americans represented close to half of all non-Indigenous people on American soil.

The second chart indexes every major population group to 1x at their year of significant arrival, then tracks their relative growth to 2020. Because the Black American population received no outside reinforcement after 1808, its growth curve represents internal generational multiplication alone. By 2020, using 1619 as the baseline, that multiplication reaches roughly 46,000 times the starting figure.

The 2020 U.S. Census records approximately 204 million people identifying as white and approximately 41.8 million identifying as Black or African American. A reader encountering those figures for the first time might reasonably conclude that white Americans have historically represented the larger and more established population. The demographic record distinguishes between the size of a population at a given point in time and the duration of its continuous presence. These are different measurements, and conflating them produces a distorted picture.

Three findings from the historical record address this directly.

The visual record that follows draws directly from the Library of Congress, the Smithsonian National Museum of African American History and Culture, and the National Archives. All items carry no known restrictions on publication. Each links to its original institutional record. These documents were not created to support any argument in this article. They were created to record what was happening at the time. What this article argues is simply what those records, read in sequence, show.

This map was not made by an advocate. It was made by the United States federal government and certified accurate by the Superintendent of the Census. The counties that appear darkest -- where enslaved people represented the highest percentage of the total population -- are the same counties where Freedmen's Bureau records and 1870 census continuity analysis show the deepest post-Emancipation Black American presence. The geography of forced labor became the geography of continuous presence. Two centuries of people growing in place, in the same counties, across the legal boundary of Emancipation.

This photograph documents in a single frame what the census data confirms in aggregate. Five generations alive simultaneously means this family's continuous presence in Beaufort County, South Carolina stretches from the mid-1700s to the 1860s. The photograph was taken during the Civil War. The people in it had not yet been emancipated. The oldest member of this family was born before the American Revolution. The youngest was born into slavery. All of them were born in the same place. That is what continuous presence looks like on a human scale, before any statistic is calculated.

Leutze painted this work in 1851, using American tourists and art students as models in his Düsseldorf studio. It is not a documentary record of the crossing. Art historians have noted that one of the rowers at the bow is depicted as an African American. Whether that figure represents any specific person cannot be established. What the military record does confirm is that Black soldiers served throughout the Continental Army during the Revolutionary War. The 1st Rhode Island Regiment, formed in 1778, was one of the first formally integrated military units in American history. Black Americans were part of the founding military effort. The painting, whatever its historical inaccuracies, chose to include that presence. That choice was deliberate -- Leutze was a committed abolitionist, and the painting was made 30 years before the Civil War. The presence of a Black figure at the bow of Washington's boat, in a painting exhibited to 50,000 viewers in New York in 1851, was not incidental.

The Gordon photograph and the First Vote illustration together mark the span of eight years between 1863 and 1871 -- the period in which the reality of Black American life in the United States shifted from legally enforced enslavement to formal citizenship. Both documents were produced by mainstream American publications reporting on current events. Neither was created for historical commentary. The people depicted had been in the country for generations. The legal status assigned to them changed. The presence did not.

Compare this 1874 atlas plate to the 1861 Coast Survey map earlier in this article. The same counties that showed the heaviest enslaved population concentration in 1860 show the heaviest free Black American population concentration in 1870. Emancipation changed legal status. It did not scatter the population. The families stayed where they had been building for generations. That geographic stability, documented by the federal government across both maps, is the foundation of the state-by-state continuity figures in the section below.

The following figures represent estimated shares of each state's current Black population whose family lineage traces to pre-1865 in-state presence. The methodology draws on Freedmen's Bureau records (NARA Series M1875/M1907), 1860 slave schedules, and geographic continuity matching between the 1860 slave schedules and the 1870 population schedules for the same counties. The 1870 census was the first to enumerate formerly enslaved persons individually by name, making before-and-after comparison by county possible.

The pattern holds consistently across all 13 states: the counties with the highest enslaved population density in 1860 show the highest free Black population density in 1870, and those same counties account for the highest share of current Black residents with traceable pre-Emancipation in-state ancestry. Hover any state for the primary source basis.

The records underlying this analysis are publicly accessible. The following collections hold the original documents, maps, photographs, and genealogical records cited throughout this article.

The following documentaries and books cover the same historical ground this article draws from, each approaching it from a different angle. All four documentaries are available free on PBS.org or the PBS app with a free account. Where a full episode is embedded, some content may require a free PBS login to unlock. Trailers play without an account.

PBS Documentary -- Most Directly Relevant

The African Americans: Many Rivers to Cross

Henry Louis Gates Jr. | PBS, 2013 | 6 episodes, 6 hours | Peabody Award

The most comprehensive documentary treatment of the Black American founding-era presence. Episode 1, "The Black Atlantic," covers 1500 to 1800 -- the period this article's population analysis draws from most heavily. Gates traces the arrival of Africans at Jamestown in 1619, the growth of the plantation economy in the same Southern states analyzed in Chart 01, and the closing of the slave trade in 1808. Produced in collaboration with more than 30 historians.

Relevance: Covers the exact founding-era population dynamics, geographic concentration, and legal closures documented in the charts above. Gates's narration on the 1808 trade closure and its demographic consequences directly parallels the population methodology used in this article.

Watch on PBS.org -- free with a PBS account

PBS Documentary -- Post-Emancipation Geography

Reconstruction: America After the Civil War

Henry Louis Gates Jr. | PBS, 2019 | 4 episodes, 4 hours | duPont-Columbia Award

Covers the twelve years from 1865 to 1877 -- the exact period in which the Freedmen's Bureau records cited in this article were created. Gates examines what happened to Black Americans immediately after Emancipation: which counties they stayed in, how the Bureau documented labor contracts and family registrations, and why the 1870 census geographic concentration reflects the same counties where 1860 slave schedules placed their ancestors.

Relevance: The Freedmen's Bureau records and 1870 census continuity analysis in this article's methodology section are the same primary sources Gates builds his documentary narrative around. The geographic patterns he discusses match the state-by-state figures in the table above.

Watch on PBS.org -- free with a PBS account

PBS Documentary -- Foundational Context

The Civil War

Ken Burns | PBS, 1990 | 9 episodes, 11.5 hours | Most-watched documentary in PBS history | 2 Emmy Awards

The foundational American Civil War documentary, built from 16,000 photographs and the letters and diaries of soldiers, freedpeople, and civilians. Historian Barbara J. Fields's commentary directly addresses the demographic and legal status of Black Americans during the war years. Burns uses the Gordon photograph and the O'Sullivan Smith Plantation series -- the same Library of Congress images in this article's visual evidence section.

Relevance: Establishes the immediate human context for the 1865 Freedmen's Bureau records this article's state continuity methodology relies on. Forty million viewers watched its original broadcast, making it the shared visual reference point for most Americans' understanding of this period.

Stream on PBS.org

PBS Documentary -- Black Americans at the Founding

The American Revolution

Ken Burns, Sarah Botstein, David Schmidt | PBS, 2025 | 6 episodes, 12 hours | 96% on Rotten Tomatoes

The most recent major documentary treatment of the American founding, covering 1763 to 1789. Burns documents the presence of Black Americans -- enslaved and free -- throughout the Revolutionary War, including Black soldiers in the Continental Army. Amanda Gorman voices Phillis Wheatley, born enslaved, who became the first published African American poet. The series directly addresses the contradiction between the Declaration's language and the institution of slavery its signers maintained.

Relevance: The founding-era Black American presence documented in Chart 01 -- the period from 1619 to 1790 when the Black American population surpassed the original colonial line -- is the same period Burns covers. Now streaming on PBS, Amazon Prime, and Apple TV.

Stream on PBS.org, Amazon Prime, and Apple TV

The following books address the same historical ground from different angles -- demographic scholarship, personal genealogy, primary narrative history, and cultural analysis. Some are peer-reviewed academic works. Others are written for a general audience. All are available through major booksellers and most public library systems.

Population History -- Companion to PBS Series

The African Americans: Many Rivers to Cross

Henry Louis Gates Jr. and Donald Yacovone | SmileyBooks, 2013

Five hundred years of Black American history, from the first Africans in the Spanish Americas in 1513 through 2013. Goes further than the documentary in examining the ethnic diversity of Africans brought during the slave trade, how slavery was practiced differently across Southern states, and how the post-1808 closed population grew in place. Yale historian David Blight called it everyone's American and African American history.

Relevance: The chapter on 1619 to 1808 directly supplements Chart 01. Geographic coverage of South Carolina, Mississippi, and Virginia matches the state continuity figures in this article.

Post-Emancipation Suppression -- Why the Numbers Are What They Are

Stony the Road: Reconstruction, White Supremacy, and the Rise of Jim Crow

Henry Louis Gates Jr. | Penguin Press, 2019

Documents the dismantling of Reconstruction from 1877 onward -- voter suppression, convict leasing, redlining, and the systematic destruction of Black wealth and political power. Explains with primary source documentation why the Black American population's current size reflects growth achieved under sustained, institutionalized constraint, not an absence of founding-era roots. Essential context for Finding 02 in this article.

Relevance: The post-1865 suppression mechanisms Gates documents are the documented reason the Black American population is smaller than it would otherwise be -- one of the three core findings in this article's contextual section.

The Great Migration -- Why People Left and What They Left Behind

The Warmth of Other Suns: The Epic Story of America's Great Migration

Isabel Wilkerson | Random House, 2010 | National Book Critics Circle Award

The definitive account of the six million Black Americans who left the South between 1915 and 1970, told through three individual life stories across three decades. Wilkerson spent fifteen years interviewing more than 1,200 people. The book documents why families left the states with the highest population continuity figures in this article -- and what leaving cost them in terms of roots, land, and community. It is simultaneously a story of presence and departure.

Relevance: The Great Migration partially explains why states like Mississippi and South Carolina, which show the highest pre-Emancipation continuity, have lower current Black populations than Northern cities. The depth of roots left behind is what this article's geographic analysis documents.

Structural Analysis -- How Continuity Became Hierarchy

Caste: The Origins of Our Discontents

Isabel Wilkerson | Random House, 2020 | #1 New York Times Bestseller

Argues that American society operates through a hidden caste system -- not merely a race problem -- in which Black Americans, as the founding-era enslaved population, occupy the bottom caste regardless of individual achievement. Wilkerson draws on primary sources, comparative history, and personal narrative to document how a population that has been continuously present since the founding became simultaneously the most foundational and most systematically disadvantaged group in the country.

Relevance: Provides the structural framework for understanding why the demographic continuity documented in this article has not translated into proportional civic and economic standing -- the gap between length of presence and quality of treatment.

Personal Genealogy -- What Continuity Looks Like From Inside a Family

Roots: The Saga of an American Family

Alex Haley | Doubleday, 1976 | Pulitzer Prize Special Citation

Alex Haley's account of tracing his family from Kunta Kinte's capture in The Gambia in 1767 through seven generations of American slavery, Emancipation, and the early 20th century. What Haley documented through years of archival research is the same genealogical continuity this article examines statistically -- a single family line, unbroken, from 1767 to the 1970s, rooted in the same geographic corridor of the American South. The 1977 TV adaptation reached 130 million viewers over eight nights.

Relevance: The individual genealogical story Haley tells is the human-scale version of the population continuity this article documents in aggregate. His methodology -- tracing family through slave schedules, Freedmen's Bureau records, and census rolls -- is the same methodology this article's state analysis draws on.

Primary Demographic Source -- The Numbers Behind Chart 01

A Population History of North America

Michael R. Haines and Richard H. Steckel, eds. | Cambridge University Press, 2000

The peer-reviewed source for the pre-1790 population estimates in Chart 01. Haines and Steckel compile data from colonial records, estate inventories, church registers, and archaeological evidence to estimate population sizes before the first federal census. Chapter coverage of the colonial-era enslaved population in the Southern states provides the scholarly foundation for the founding-era comparison this article makes. This is Citation 2 in this article's methodology section.

Relevance: The 1607 to 1790 data points in Chart 01 come from this volume. Readers who want to examine the underlying demographic methodology will find it here.