Railroads
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The building of the transcontinental railroad system made it easier and faster for companies to ship goods longer distances. Also, the railroad system was a faster way to travel. It is important because it made America more efficient.
Oil
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The oil industry during the Gilded Age thrived. John D. Rockefeller Sr. played a role in the success of Standard Oil's business. Rockefeller was a refiner and hands-on businessman. Standard Oil became one of the biggest industries in the United States for that time period.
Steel
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The Gilded Age brought the advancement of the steel industry. There were more things to make with steel and higher demand for it. A more efficient way of making steel was discovered and it also made larger quantities, bigger dimensions, and very versatile steel.
Technology
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The improvement of the technological industry was a very important thing during this time. The improvements in this industry helped make it possible to have improvements in other industries as well. That is why the technological industry is so important.