What was the main cause of the Civil War?

What was the main cause of the Civil War? You must include at least four 6w facts. Two of these facts should come from 1)1835-1860 period and 2) 1861 war period and 3) Reconstruction 1865-1877.

You must consider the period from 1835-1860.

You must consider events during the war that show your main cause.

You must consider how the post-war Reconstruction period shows the main cause.

This essay should be a minimum of 4 pages (1000 words). You can write less but your grade will reflect that you did not explain yourself fully.

The Foner text supplies you with facts. The articles and films give you at broader understanding of the issues.