What is the number one cost of the American Civil war?

A social, B economic, C political.

B.

Four years of civil war drained the American economy in both the North and the South. In the 1850s, the U. S. government was spending about $1 million every week. By mid-1861, the first year of the war, the Union alone was spending $1.5 million every day, and the amount continued to climb.

Political is the best answer