Explanation:
Italy
The Renaissance eventually spread from northern Italy to the rest of Europe. Italy had three advantages that made it the birthplace of the Renaissance: thriving cities, a wealthy merchant class, and the classical heritage of Greece and Rome. large city-states in northern Italy. The region also had many sizable towns.
A naval base is the answer
Their entry into the war boosted the morale of the other allied nations. Morale completely depleted seems how the war was ultimately a stalemate and lives were being lost needlessly. American entry into the war also discouraged the Axis powers, and later after America's entry the Axis powers began to drop deeper into fear. America was the turning point for the war. The Axis powers were winning and if it weren't for America, then the Axis powers would have prevailed and the world would not be the way it is today. (This is what I think about it, it might not be entirely correct.)
Helios threatened to not shine anymore.
Technically Helios threatened to only shine in Hades, among the dead. However, this is the most similar to what happened in the legend. Therefore it is most likely the correct answer.
Oct. 29 1929 - 1939. Surrounding Decline before and Fallout after surrounding these dates can be found, but overall this is the most commonly accepted timeline.