According to some historians, which marks the beginning of the us civil war

Bloody Kansas and Election of President Lincoln

Explanation:

The South belived that Lincoln was going to free all the slaves until states from the south started to succeeded from the union. Bloody Kansas caused people from the north and south to compete for the right of free or non free slave state.

(e) a major consequence of the election was that several southern states

probally   a few days after there called