Answer:
Gaul
Faced with the intransigence of the Senate, Caesar and the 13th Legion cross the Rubicon, the official border between Gaul and Italy, a decision that will lead to civil war.
Answer:
By 1860, 30,000 miles (49,000 km) of railroad tracks had been laid,.
By 1860, 30,000 miles (49,000 km) of railroad tracks had been laid, with 21,300 miles (34,000 km) concentrated in the northeast.