The right answer for this question is the enslaved African Americans. This was a form of resistance against slavery, where slaves became less efficient on purpose in order to rebel against their masters a lot.
B. It was a challenge to decide how to divide forces and protect two coasts.
Yankee - Northerner
Secede - Break away
Border State - Slave states that bordered the northern free states during the Civil War.
Union - The states that remained under the US government during the Civil War.
Confederacy - The states that seceded from the union in order to preserve slavery.
Hope this helps! If you could mark this answer as brainliest I would really appreciate it!
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The Great Migration is depicted in the image. Also known as the Great Northward Migration, it marked the movement of 6 million african americans from the rural south of the United States to the Northwest, Midwest and West, that took place between 1916 and 1970. It was one of the most rapid internal migrations in the world not caused by war or famine, and it meant leaving their economic and social base to find a new one, made easier by the labor shortage that WWI had generated.