Which of the following best shows how the issues of state's rights contributed to the onset of Civil War?A many southerners believed the rights of their states were threatened by the northern abolitionist b.Many northerns believe the right of their states were threatened by the election of Abraham Lincoln, c.Many southerners believe that giving states additional rights would hold back.Western expansion d many northerners believe that states rights should not extend to slave state

a.Many southerners believed the rights of their states were threatened by the northern abolitionist