1. NHGIS National Historical Geographic Information System

2. Illustration of our Editing Process 1. Scan Paper Maps

3. Editing Process 2. Heads up editing

4. Editing Process 3. Overlay

5. Editing Process 4. Using TIGER lines to make changes

6. Editing Process 5. Completed edits

7. Data Comparison Minneapolis, MN vs. New Orleans, LA Legend standardized between cities Percent of total population that considers themselves ‘Black’

8. Percentage Black, 1940

9. Percentage Black, 1960

10. Percentage Black, 1980

11. Percentage Black, 1990

12. Percentage Black, 2000