U.S. involvement in World War I and World War II have distinctly different causes, effects on American society, and consequences of U.S. involvement in global problems. During World War I, the United States maintained economic ties with Great Britain, while World War II was sparked by the spread of communism and fascism. World War II was actually caused by the aftermath of World War I. World War I began with tensions in Austria-Hungary and the enmity Germany had with parts of Europe. Although there have been wars and battles between other countries, two wars that involved the main warring countries and caused much damage and death were World War I and World War II. The First World War started in 1914 and lasted four years until 1918. The Second World War lasted longer than the first, it lasted six years from 1939 to 1945. The reasons for these wars are very different as well as combat methods. the war and its consequences. One similarity behind all its differences is the horrific outcome it left behind, the loss of life and massive destruction. What started World War I was the murder of Archduke Francis, heir to Austria and Hungary, on June 28, 1914, who was killed by a Serbian nationalist. The nature of this war was between countries for the acquisition of colonies, territories and resources. The invasion of Serbia was another cause of the outbreak of war, and at the same time of the invasion, Germany invaded Belgium, Luxembourg and France. A number of new alliances were formed which then caused the conflict to spread across the world. The invasion of Bosnia by Austria and Hungary caused outrage in many European countries. At the time, Europe was divided into countries with a strategic political and military confederation. Following the wars between Germany, the inv...... middle of paper ......tions. Tanks and submarines were also used during the war. During World War II, new innovations were introduced, but they were simply modernized from the technology used in World War I. The war ended with Allied victory over Germany and Japan in 1945. These two world wars caused a lot of damage to the lives of many people. people but were fought for the protection of other countries and for the United States. World War was fought to acquire land while World War II was fought to contain fascism and communism. Each war had different fighting methods and use of technology. Overall, these wars caused many unforgettable things such as genocide and frightened people's daily lives. Although the damage of the war caused much political, economic and social destruction for the countries that participated in it, it helped countries rebuild and get back on their feet...