During WWII Germany used the tactic of attack called the blitzkrieg and it is where they used large amounts of fast tanks and aircraft to invade countries quickly and surprise the enemies, the downside was that this used up a lot of gasoline very quickly.
Proponganda was important for the war efforts during World War I because people needed to passionate about the country they were fighting for. This is also known as Patriotism.
The answer should be A. Great Depression.
The “exchange” introduced a wide range of new calorically rich staple crops to the Old World namely potatoes, sweet potatoes, maize, and cassava. The primary benefit of the New World staples was that they could be grown in Old World climates that were unsuitable for the cultivation of Old World staples.