Answer:
Explanation:
Natural fortifications also helps defend a country. For example the Alps in Italy defends them very well. Rivers can also be a defensive position a country can fall back to. So no, fortifications and defenses arent the only thing. Nature is able to help too.
Over 20 million people were injured in World War 1. Over 8 million died and 5 million were held prisoners.
Put this in the math section.
