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.
An easy to remember list of the most important issues surrounding the causes of the war is: Militarism-many countries believed it was important to build large armies and navies. Alliances-the Triple Alliance and the Triple Entente were said to have been formed to help prevent war.