Which answer best shows how the issue of states' rights contributed to the start of the Civil War?
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A. Many Southerners believed the rights of their states were threatened by Northern abolitionists.
B. Many Southerners believed that states' rights should not extend to slave states.
C. Many Northerners believed that states' rights should not extend to slave states.
D. Many Northerners believed the rights of their states were threatened by the election of Abraham Lincoln.