The answer is D. I've done some research.
The election was held on Tuesday, November 6, 1860. ... The election of Lincoln served as the primary catalyst of the American Civil War. The United States had become increasingly divided during the 1850s over sectional disagreements, especially regarding the extension of slavery into the territories.
The American Revolution change American society socially. The Revolution also unleashed powerful political, social, and economic forces that would transform the post-Revolution politics and society
