The construction of the first transcontinental railroad in the USA, completed in 1869, was a monumental feat that united the country from coast to coast, transforming the national economy and geography. Initiated during the Civil War under President Lincoln, it involved the Union Pacific and Central Pacific, facing extreme challenges and fierce rivalries. The completion, celebrated with the "Golden Spike" ceremony at Promontory Summit, Utah, drastically reduced travel time, boosting national integration and economic development.
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