Which of the following was one cause of the civil war in the united states?
a. the south wanted new states to allow slavery and the north did not.
b. the north wanted new states to allow slavery and the south did not.
c. the north opposed signing treaties with native americans.
d. the south opposed signing treaties with native americans.

The correct option is A

The causes of secession were complex and have been controversial since the war began, but most academics identify slavery as a central cause of war. Slavery was the central source of escalating political tension in the 1850s. The Republican Party was determined to prevent any spread of slavery, and many southern leaders had threatened secession if the Republican candidate, Lincoln, won the elections. elections of 1860. After Lincoln won, many Southern leaders felt that disunity was their only option, fearing that the loss of representation would hamper their ability to promote acts and policies in favor of slavery.

i can try to solve it just show the graph.