It was the first multicultural empire in history. It was also the first very large empire. Because of this the Empire had to develop ways of running effectively. Roads were built over great distances. Standardize currency. Localized governing systems (i.e. satrapies). It was also the first time Asian powers attempted to invade Europe.
Answer:
France, Britain, and the United States declared war on Germany following Germany’s invasion of Poland.
The Nazi loss in the Battle of the Bulge sealed the Third Reich's fate-- the Allies were free to invade Germany, causing its downfall.
I believe it'd be a. I hope this helped