New technology introduced during World War I shaped the way wars would be fought from then on. For the first time, tanks, airplanes and machine guns made their way onto the battlefield. These new technologies magnified the effects of war, both in terms of how war was fought, but also how war affected people. World War I had a devastating effect on the world in terms of lives lost, with over 37 million casualties [source: Infoplease].
Countries that were hit hardest by the war