What characterize the time period from 1900to 1945?

What was some nicknames of generals in the civil war? Why did Truman order planes to airlift supplies to West Berlin? What are the factors causing world world 1? World War 1 was known for what kind of fighting? What land prior were the countries fighting over in World War 1? What did londoners do when the German bombed their city? What describes a reason for opposition to the war in Iraq? What were the names of the US ships at the Battle of Midway? What does the BAR mean in World War 2? Phosgene gas exposure from working with freon.? Who controlled the North Vietnam? Who surrendered on VE-day? How did Tecumseh deal with white invasion? Why were Japanese people in America put in Relocation Camps during World War 2? What was the invasion of Normandy like? Which civilization is most similar to the Aryans? Which Union soldier rose from obscurity to become a general in the western theater of the Civil War to accepting the surrender of the Army of Northern Virginia at Appomattox Courthouse Virginia.? Who instructed the japaneese navy to fight in the Battle of Midway? Was there any technology during the Holocaust? What does the monitor and the merrimack have in common?