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The main factor that slowed construction of the Central Pacific railroad was
A: a...
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HELP?!
The main factor that slowed construction of the Central Pacific railroad was
A: a shortage of supplies, which had to be shipped around South America.
B: intense summer heat that melted the railroad ties and tracks.
C: scarcity of wood used for building railroad ties and trestles.
D: conflicts with American Indians who closed down the tracks.
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