Answer:
The reality of war was in stark contrast to the previous beliefs and attitudes Europeans had.
Explanation:
Pre-war Europe included many nations that celebrated their military. To fight was to be honorable and glorious. However, in the Great War, warfare was much more gruesome than previously. The introduction of gas attacks, trench warfare, and other technological/military "improvements" caused lives to be needlessly lost for little to nothing in advancements. During and after the war, people began to realize that it wasn't worth it and the youth suffered terribly.
Barack Obama's first summer job was at Baskin Robbins
Most fictional sources either have morals, or you'll often find that they actually have some historical accuracy i.e. they were influenced, the story will have a reflection of the author's opinions on the current situation when he wrote it.
Because he proved that the earth wasn't at at centre of the solar system like everyone thought it did. It also showed the sun doesn't move, it's the earth moving around it.