1. Why did the growth of a nationwide railroad network make time zones necessary?

The need for continental time zones stemmed directly from the problems of moving passengers and freight over the thousands of miles of rail line that covered North America by the 1880s. Since people had first begun keeping track of time, they set their clocks to the local movement of the sun.

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explanation:

a trial judge has broad powers in his courtroom. the judge's decision is usually final for the duration of the trial, and the party's one special type of witness is an expert witness.