How dis the economy of the United States change during 1850 to 1890

They used railroads to transport their goods and expand their businesses across the country, which helped increase their profit, therefore making America one of the most economically powerful countries in the world.

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the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.