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America declared war on German because German kept attacking passengers with submarines and merchant ships in 1917 which became the main reason to Wilson's decision in leading the United States into World War 1. The situation of Germany had changed by January 1917. German leaders maintained that they could break the "Sussex vow," since the United States could no longer be regarded a neutral party after sending weapons and financial help to the Allies. Germany also considered that the United States had risked its neutrality by acquiescing to the Allied blockade of Germany.

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The Great War, also known as World War 1 happened in 1914 by Austria-Hungary because of the assassination of Archduke Franz Ferdinand where various countries allied and fought their enemies which led to a big war. The war ended in 1918 with the help of the Treaty of Versailles where various central power especially German had to pay debt to the victims of the World War.

After some years, German was not able to handle the debts so they declared war which was held by Adolf Hitler. They started invading Poland because Poland was an allied country with Great Britain and France and it was the closest country among the rest. However, it had a domino effect since Poland had allies to backup. This kept repeated and occurred until 1945 to the end of World War 2 where the United States won the war with nuclear weapons.

After the World wars, another war happened which was called the Cold War where the United States and Russia had a conflict on each other and had a war in Asia because there were many communist countries surrounding Asia like Russia, China, North Korea, North Vietnam, etc. which the Americans thought that there would be a domino effect to other countries if Soviet Union will stay as a communist country.

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The Treaty of Versailles was signed in 1919, after the World War 1 to stop conflicts and fights against Germany and its allies. The Treaty of Versailles gave inequality and punishments such as debts, demilitarization, and territorial loss to German for starting the war. This gave German an economic distress and struggle which led them to cause the second World War in 1939 held by Adolf Hitler.

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Germany declared the second World War on Poland to receive their lost territories and because of the economical distress from the debts they had to pay from the Treaty of Versailles. However, they thought that this was unequal for them to pay and give massive debts and territory which lead to the World War 2 held by Adolf Hitler.

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Christopher, Klein. (Aug 5, 2017). Should the US have entered World War 1.
https://www.history.com/news/history-faceoff-should-the-u-s-have-entered-world-war-i .

History.com, Editors. (Dec 18, 2019). Treaty of Versailles.
https://www.history.com/topics/world-war-i/treaty-of-versailles-1 .

History.com, Editors. Germany invades Poland. (Nov 16, 2009) https://www.history.com/this-day-in-history/germany-invades-poland .

History.com, Editors. Bombing of Hiroshima and Nagasaki. (Nov 8, 2009)
https://www.history.com/topics/world-war-ii/bombing-of-hiroshima-and-nagasaki

History.com, Editors. Pearl Harbor. (Oct 29, 2009)
https://www.history.com/topics/world-war-ii/pearl-harbor .

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Japan surprisingly attacked the Pearl Harbor, which was one of the main military naval base on December 7, 1941 where the Japanese forces managed to destroy 8 battleships, 20 naval vessels and more than 300 airforces. It also killed around 2400 Americans including citizens and another 1000 people injured. Because of this massacre, Franklin D. Roosevelt declared war on Japan.

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During World War 2, August 6, 1945, the American air forces attacked Hiroshima and Nagasaki of Japan with the world's first atomic bomb which caused approximately 120,000 people quickly to death and 74,000 citizens wounded. This event caused Japan to unwillingly surrender in World War 2.

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In conclusion, I think that the several World Wars in the past were crucial but also an effect to grow the economy from the learnings of the attacks countries have encountered. However, since we know how brutal it was, it should not happen anymore for the victims in the past and the victims in the wars that are happening even until now such as the Afhganistan's war and the Ukraine war. It is true that, there were war crimes which can still be a hurtful and painful memory for many people and we have to respect the people who have fought by sacrificing themselves in war.