1862, Repubs in Congress (more power bc Civil War) pass act outlining route for 1st Transcontinental RR, divided task between Union Pacific, Omaha, Nebraska to west (Irish workers) and Central Pacific, Sacremento through Sierra Nevada (Chinese workers), meet in Utah at Promontory Point, 1869 -- this promotes mass production and consumption, as well as steel+coal industries, immigration, urbanization, time zones created