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Social Studies, 25.02.2021 18:40 gianni0

In the U. S. in the 1830s, miles of track had been laid. By the 1860s, miles of track had been laid. a.
40,000 and 30
b.
30,000 and 30
c.
40 and 30,000
d.
400 and 40,000

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