Final answer:
The Transcontinental Railroad was completed on May 10, 1869, linking the East and West coasts of the United States, marking a pivotal moment in American history as the nation was united by rail.
Explanation:
The Transcontinental Railroad was completed on May 10, 1869, when the westbound Union Pacific crews met with the eastbound Central Pacific at Promontory Point, Utah. This significant event effectively connected America from coast to coast, marking a crucial moment in American history. By 1890, the railway network in the United States had expanded significantly, with around 180,000 miles of railroad tracks across the nation post the Civil War.
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