By using the map, the approximate length of the National Road is 820-mile or 1320 Km.
The National Road was the first federally funded road that begun in 1811 in Cumberland, Maryland and stretch to Wheeling,
In 1818, the road in western Vir.ginia reached Vandalia, Illiniois,
in the 1850. the road was linked to bridges that allows its pass over many rivers and stream.
In conclusion, using the map, the approximate length of the National Road is 820-mile or 1320 Km.
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