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 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.