Name 4 new trend in popular culture during the 1920's

Me asap with these two questions about wwi 20 points will be rewarded.1. what is the significance of the battle of somme? 2. how many years into the war did it take for germany to use poison gas on a large-scale?

How w.e.b. dubois wanted to improve the social and economic situation that existed for african americans during the early 19th century?

What religion influenced the first persian empire as established by cuyrus the great?