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.
Causes Of Secession. Before the Civil War, the country was dividing between North and South. Issues included States Rights and disagreements over tariffs but the greatest divide was on the issue of slavery, which was legal in the South but had gradually been banned by states north of the Mason-Dixon line.