Which of the following was a key cause of world war 2? A. The assassination of Archduke Fran Ferdinand by Serbian nationalists
B. The dangerous and aggressive expansion of totalitarian nations
C. The soviet Union's efforts to spread communism around the world
D. The establishment of alliances between Japan, Russia, and Great Britain

answer: secession

secession, as it applies to the outbreak of the american civil war, comprises the series of events that began on december 20, 1860, and extended through june 8 of the next year when eleven states in the lower and upper south severed their ties with the union. the first seven seceding states of the lower south set up a provisional government at montgomery, alabama. after hostilities began at fort sumter in charleston harbor on april 12, 1861, the border states of virginia, arkansas, tennessee, and north carolina joined the new government, which then moved its capital to richmond, virginia. the union was thus divided approximately on geographic lines. twenty-one northern and border states retained the style and title of the united states, while the eleven slave states adopted the nomenclature of the confederate states of america.

explanation:

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else