riddle - separate with a riddle, as grain from chaff screen sift, sieve, strain - separate by passing through a sieve or other straining device to separate out coarser elements; sift the flour
Causes of the Civil War: Abolitionism. The issue of slavery was further heightened by the rise of the Abolitionist movement in the 1820s and 1830s. Beginning in the North, adherents believed that slavery was morally wrong rather than simply a social evil.
The answer to the cause of the war is as large as the war itself. The best way to answer this question is with this statement. The US Civil War was the result of Southern slave states believing that their way of life, slavery, and its economics were becoming marginalized.