In the United States in the mid-nineteenth century,

Question

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During the mid-nineteenth century in the United States, the Democratic Party became identified with the southern planters and their interests. This was primarily due to their support of slavery, which was a central issue of the time. The Republican Party, on the other hand, was dedicated to abolitionism and fought to end slavery. Therefore, option D is the best choice. The other options are not accurate, as southerners did not argue that slaves and industrial workers were treated equally, popular sovereignty did not resolve the problem of slavery, and while the slavery issue did produce strong feelings of nationalism, this is not the best option among the choices given.

In the United States in the Mid-Nineteenth Century