On which of the following issues did lincoln and davis most strongly disagree?
a) whether the south had seceded for a reason
b) whether the south had the right to secede
c) whether slavery would continue to exist in the south
d) whether the north and the south would go to war

They differed in the decision whether slavery would continue to exist in the South.

Lincoln used to express moral opposition to slavery in public and in private. He attempted to stop the expansion of slavery and proposed compensated emancipation at the beginning of his presidency. Later, he stated that slavery should not be allowed to expand any more U.S. territories. He was afraid of the expansion blocking "free labor on free soil" in new western lands.

whether slavery would continue to exist in the South.

Explanation:

answer; ///i believe that the correct answer is (a) the great depression

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