Over time, historians have changed the ways they study the past because
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Explanation:
In the 1850s debates over slavery increased due to the different viewpoints of the North and South. The Compromise of 1850 admitted California as a free state and divided the remainder of the Mexican Cession into Utah and New Mexico allowing settlers to decide the slavery issue by majority vote. The economics of slavery were probably detrimental to the rise of U.S. manufacturing and almost certainly toxic to the economy of the South. ... From there, production increases came from the reallocation of slaves to cotton plantations; production surpassed 315 million pounds in 1826 and reached 2.24 billion by 1860
