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
Causing the Civil War. Historically, textbooks have taught that incompatibility between northern and southern economies caused the Civil War. The industrial revolution in the North, during the first few decades of the 19th century, brought about a machine age economy that relied on wage laborers, not slaves.
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.