USA data maps

African American population:

Dot density maps	Gridded color maps
1890 1900 1910 1920 1930 1960	1890 1900 1910 1920 1930 1960

Manufacturing in the US:

• 1900
• 1910 - more detail
• 1920
• 1929

U. S. Railroad map ca 1900

Political violence in America - 20th century events

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