Why did the building of the Transcontinental Railroad have to be shelved for a few years?

Iron rails rusted, and the wait for steel rails was extremely long.
There were not enough workers to complete the building process.
Native American attacks made the work entirely too dangerous.
The Civil War disrupted the building process of the railroad.

D?

1 answer

Good guess -- but it's wrong.

https://www.shmoop.com/transcontinental-railroad/timeline.html
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