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The main causes of World War 1 were militarism, alliances, imperialism, and nationalism. Countries had more than quadrupled the amount of money spent on defenses, and alliances were beginning to form in Europe in the form of the Triple Entente and the Triple Alliance. Imperialism between nations and nationalism amongst the people of larger countries also helped lead to the war.

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America joined the war for reasons including the Zimmerman note, German unregulated submarine warfare, and the Russian Revolution. The Zimmerman Note was a telegram from Germany to Mexico offering to fund an invasion of America to keep them out of the war. This note was intercepted and angered Americans. This along with American ships being sunk by Germans and Russia becoming Communist led to America finally joining World War 1.

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Almost all of the fighting during World War 1 took place in Europe. As Germany tried to invade the surrounding nations, fronts were set up around mainly France and Russia. Due to trench warfare and other factors, neither force made fast advancements into enemy territory.

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The Allied powers consisted of France, Great Britain, Russia, Italy, Japan, and the United States. The Central powers consisted of Germany, Austria-Hungary, Bulgaria and the Ottoman Empire. There were nation in Europe who stayed neutral such as Spain, Sweden, Switzerland, Denmark, and others.

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British wartime posters encouraged citizens to join the war effort to provide more support in the military and help save the country.

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During the war, dogs were trained for specific roles such as the location of the bodies of soldiers. This was used to appeal to the people that if dogs were participating in the war effort, so could they.

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War poster portrays Germany as an evil animalistic monster. He is attacking a woman meant to represent German culture killing what Americans desire.

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At the time, World War 1 was the deadliest conflict seen in modern history. In all, there were 40,000,000 casualties. The majority of the casualties came from countries such as Germany, France, Russia, and Austria-Hungary.

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The term doughboys were given to the American soldiers fighting in World War 1. This name was thought to be given to them because of the dough shaped buttons on their uniforms as well as the dust and clay gathered on their clothes giving off the appearance of dough. The United States had around 4.7 million doughboys during the war.

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Trenches were long, deep ditches dug for protection in WWI warfare. Due to the unsanitary conditions, diseases such as dysentery, typhoid fever, cholera, and trench foot spread greatly among the soldiers fighting in close proximity. Around 35,000 miles of trenches were dug during the war, and this type of warfare resulted in the slow advancement of troops and many casualties.

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The United States government issued messages to everyday people encouraging them to ration and consume food during the war. There were many food and supply shortages during this time and rationing them would result in a stronger country for longer. The government used propaganda such as "Meatless Tuesdays" to further encourage this rationing

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This poster was encouraging everyone, even children to do what they could to help in the war effort. War saving stamps could be bought for 25 cents, and if enough were accumulated, they could be traded for bonds. By this process, even those with no income, such as children, could help support the war.

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Poster made to encourage France as well as the other Allied Powers to continue fighting during the war.

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In World War I, weapons such as machine guns, tanks, submarines, were used for the first time in a major war. Machine guns revolutionized the battlefield with their fast rate of fire, and chemical warfare such as mustard gas was used in places such as the trenches. The use of these technological advancements in weaponry changed the way war was fought for years to come.

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The Russian Revolution took place during World War 1 and resulted in Russia becoming the communist Soviet Union. This event occurred due to Germany's plan to remove Russia from the war. By sending Lenin back to Russia and funding a full revolution, Germany successfully launched the Bolshevik Revolution turning Russia into USSR.

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Wilson's 14 Points was President Wilson's plan to resolve issues proceeding World War 1. He presented these points to the other world leaders at the signing of the Treaty of Versailles, but they did not listen. Most of Wilson's points were ignored, although in time many of them proved to be accurate and valuable.

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During the war, many more supplies were needed than normal. To resolve this issue, the United States strongly urged all who were capable to work in factories and plants to help supply necessary weapons and artillery to the troops. Propaganda was often used to lure people into this field, and many women used this as an opportunity to prove useful in the war effort.