Here are two great Google Maps applications for anyone interested in history or genealogy. The applications allow you to view the changing boundaries of different countries and U.S. counties over time.
The Historical World Boundary Map application displays world political boundaries from 1946-2008. You can click any country on the map to view how its boundaries have changed over time.
The Historical County Boundary Map displays U.S. county boundaries for any historical year. You can click any county on the map to see the specific history of the boundary changes, and navigate through different years to see the boundary changes of the county over time.
Historical County Boundary Maps
Historical World Boundary Maps
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