World War I and World War II During the 1900s, two wars broke out between the nations, World War I and World War II. These wars brought famine, death by debt and even freedom. Although some results were the same, they were fought with very different war tactics. World War I was caused by one major factor, the assassination of Archduke Francis Ferdinand. This happened on June 28, 1914. He was the Archduke of Austria-Hungary (Hartford). While World War II was caused by an agreement between the United States, France, England and Italy. This agreement obliged Germany to pay all war damages in countries affected by World War I (arms). The First World War spread to many countries: Austria-Hungary, Russia, Germany, France, Great Britain, the United States and Belgium. The leaders of nations allied themselves with each other (the United States along with France, Great Britain, Russia, Italy and Japan, they were also known as the Allied Powers). During the Allied Powers' arrangements to ally themselves, Germany, Austria-Hungary, and Turkey became the opposing forces known as the Central Powers (World War I and II). World War I lasted four years, from 1914 to 1918, and caused millions of deaths from the weapons used. The soldiers of the two opposing forces dug zigzag trenches to protect themselves. be slaughtered on level ground. These trenches were a major cause of the death toll in World War I not being as high. Military personnel brought artillery, such as machine guns, grenades, and revolvers, into the trenches and fired at them. opposing militaries (weapons) were also used to cause destruction. During this period, tanks made a huge contribution to the First World War. They were damaging everything within a mile radius, including people (Hartford......in the middle). of paper......These two wars caused massive destruction and millions of families suffered. Even though the wars had different leaders and were fought differently, the wars had fantastic results. Works Cited Mike, Bass. Personal interview. January 20, 2014. Daene, Roger. The evolution of British infantry tactics during the First World War. Roger Daène. 2014. Internet. January 16, 2014. Ellis, Elizabeth and Esler Anthony. World History: The Modern Era. 1st ed. Boston: Prentice Pearson Hall. 2007. Print. Hartford, Olivia. Difference between World War I and World War II. Difference between. 2010-1012. Internet. January 16, 2014. < http://www.differencebetween.com/difference-between-ww1-and-ww2>WWI Vs. Second World War. NP. 2004. Internet. January 16 2014.