A great site for the study of the 'raw' demographic data found in the the US Federal Census. From this site you may study populations of AA's by status (free vs slave) from 1790-1860 within each State & County. Enjoy.

Art Thomas
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http://mapserver.lib.virginia.edu/

Historical Census BrowserWhat can you do on this site?

Examine state and county topics for individual census years. examine multiple topics within a census year produce tables of data by state or county sort data by selected categories
create ratios between any two data categories

Choose a census year to begin examining data:
1790 1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900 1910 1920 1930 1940 1950 1960

Examine state and county topics over time.
examine a topic across multiple census years
produce tables of data by state or county

Choose a category to begin examining data:
General Population Ethnicity/Race/Place of Birth Education & Literacy Agriculture Economy/Manufacturing/Employment Slave Population