A historian argues that the presence of slavery in the South caused the Civil War. He argues that the slave states did not trust the federal government to protect their property and this situation led them inevitably toward secession. Which of the following factors would best serve as evidence to critique the historian's conclusion?
Question 5 options:

South Carolina's declaration of secession specifically criticized federal efforts to end slavery.

Nearly all the major crises leading up to the Civil War were directly or indirectly related to slavery.

President Lincoln successfully convinced several slave states to remain part of the Union.

Efforts to admit Kansas and Nebraska into the Union created violent conflicts over their slave status.