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Business boomed after the Civil War. It production had boosted industry in the North and given it prestige and political clout. It also gave industrial leaders valuable experience in the management of men and machines. The enormous natural resources ¿ iron, coal, oil, gold, and silver ¿ of the American land benefitted business. The new inaugurated in 1869, and the which began operating in 1861, gave industry access to materials, markets, and communications. The constant influx of immigrants provided a seemingly endless supply of inexpensive labor as well. A continental rail system, transcontinental telegraph B intercontinental rail system, continental telegraph C intercontinental road system, transcontinental telegraph D intercontinental rail system, transcontinental telegraph continental road system, transcontinental telegraph