What caused the gross domestic product of the united states to quadruple between 1860 and 1890?

The correct answer is the new industrial economy and railroads

Industrialization and construction of railroads transformed the American economy. As industrialization took hold, the US gross domestic product, that is the output of all goods and services produced annually, quadrupled- from $9 billion in 1860 to $37 billion in 1890.

a is true because it know the force.

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pepin the short[a] (german: pippin der kurze, french: pépin le bref, c. 714 – 24 september 768) was the king of the franks from 751 until his death. he was the first of the carolingians to become king.[b][2]

the younger son of the frankish prince charles martel and his wife rotrude, pepin's upbringing was distinguished by the ecclesiastical education he had received from the monks of st. denis. succeeding his father as the mayor of the palace in 741, pepin reigned over francia jointly with his elder brother carloman. pepin ruled in neustria, burgundy, and provence, while his brother carloman established himself in austrasia, alemannia and thuringia. the brothers were active in suppressing revolts led by the bavarians, aquitanians, saxons, and the alemanni in the early years of their reign. in 743, they ended the frankish interregnum by choosing childeric iii, who was to be the last merovingian monarch, as figurehead king of the franks.