The "<span>age of enlightenment" was significant to philosophical advancements in the 18th century, shaping much of today's society.</span>
On June 17, 1940, The defeated French signed an armistice and quit WW II, leaving Britain standing alone against Germany. In the Summer and fall of that year, German and British forces clashed in the skies over Britain in the first all-air battle in history.
A significant turning point in WW II, the Battle of Britain ended when Germany's Luftwaffe failed to gain air superiority over the Royal Air Force . Britain's decisive victory saved the country from a ground invasion from the enemy and proved air power alone could also be used to win a major battle.
Civil wars. Probably the most important single cause of Byzantium's collapse was its recurrent debilitating civil wars. Three of the worst periods of civil war and internal infighting took place during Byzantium's decline.
It would be in a "direct democracy" in which all citizens participate directly in the government, since they would vote on each individual matter directly instead of electing representatives to vote for them.
C) a unified European currency did not come about until the creation of the Euro -- instituted as an "invisible" currency in 1999 for trading but not available for common use (i.e., as a physical currency) until 2002.