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.
The main causes of the Second World War are expansionism, problems with treaty of Versailles, competition for resources, issues with League of Nations etc. The great depression is also one of the major causes of Second World War. The tipping point of the war was invasion of Soviet Union by the Germans and the attack on Pearl Harbor. All these causes will be discussed in great detail below.Expansionism The desire for territorial expansion was ubiquitous in the 20th century.