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Originally, various track gauges were used in the United States. Some railways, primarily in the northeast, used standard gauge of 4 ft 8 1⁄2 in (1,435 mm); others used gauges ranging from 2 ft (610 mm) to 6 ft (1,829 mm). As a general rule, southern railroads were built to one or another broad gauge, mostly 5 ft (1,524 mm), while northern railroads that were not standard-gauge tended to be narrow-gauge. The Pacific Railroad Acts of 1863 specified standard gauge
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I believe it was because these states had slavery. Though border states were spilt with oppsition.
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Mill. ...
The Odometer. ...
The Alarm Clock. ...
Cartography. ...
Olympics. ...
Basis of Geometry. ...
Earliest Practice of Medicine. ...
Modern Philosophy.
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Here ya go