THE ERA OF INDUSTRIAL ASCENDANCY: 1861-1945
After 1861 Pennsylvania's influence on national politics diminished gradually, but its industrial complex grew rapidly.
The Civil War
During the Civil War, Pennsylvania played an important role in preserving the Union. Southern forces invaded Pennsylvania three times by way of the Cumberland Valley, a natural highway from Virginia to the North. Pennsylvania shielded the other northeastern states.
Pennsylvania's industrial enterprise and natural resources…
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