The transcontinental railroad which united both coasts of the United States was initiated in 1863. The idea was for both coasts to meet in the middle. Progress in the east was fairly rapid due to wide open prairie, but progress in the west was very slow because of the Sierra mountains which forced the builders to cut a path through the mountain which was primarily granite, an incredibly hard rock, by hand using sledgehammers and dynamite. Eventually, the two halves met in Utah on May 10, 1869. T...
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