<span>B. Jazz became popular.
C. Many African Americans moved to cities in the North.</span>
<span>Russian communism, Italian fascism, and German Nazism were all varieties of authoritarian rule. It all imposed government decisions which violated personal freedom of people. The qualities of an authoritarian government that these have displayed are a powerful central government, the use of force to make people abide their governance, suppression of political organizations, bureaucracy of military. </span>
The South could not replenish fast enough. <span>Also, believe England backed the north if I remember correctly.</span>
You must be talking about the assassination of Archduke Franz Ferdinand of Austria. This was an event which triggered the start of WWI.
