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.
1 Secession and the American Civil War. 2  How the Compromise of 1850 Helped Delay the Civil War. 3  5 Things That Caused the U.S. Civil War. 4  Top 5 Causes of the Great Depression. 5  The Top 5 Causes That Led to World War I.