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Propaganda was used to convince the purchase of war bonds

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This is significant because the US invested in the outcome of the war in Europe. American banks made huge loans to the Allies. If the Allies lost, then these businesses and banks would not get their money back. The U.S. tried to use propaganda to convince people to purchase war bonds. The U.S. thought that if they enter the war, there would be a chance that they get their money back.
https://www.historyhit.com

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Wilson cited Germany's violation of its pledge to suspend unrestricted submarine warfare. This is significant because the U.S. felt like this would stop trade with certain countries and stop them from helping ship goods to Britain. Knowing that the U.S. would join the war, Germany thought that submarine warfare would help them defeat the Allies. This would cause more sinking of boats. The sinking of Lusitania killed more than 120 U.S. citizens and provoked outrage in the U.S. This is significant because this was just another factor that made the U.S. join the war.
https://history.state.gov/milestones/1914-1920

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A newspaper of how America wants to declare war on Germany

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America declared war on Germany, April 6, 1917

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America declared war on Germany, April 6, 1917

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The U.S. declared war on Germany. This is significant because America was tired of remaining neutral after many attacks from Germany. The submarine attacks and other factors were the reasons why America declared war on Germany. America joined the Allies to defeat Germany.
https://www.historycrunch.com

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This battle was significant because this was the first major American battle and offensive of World War 1. The U.S. went into their first major battle and won. It assured the French that the U.S. could be depended on. This battle proved the loyalty of the U.S. to the Allies.
https://www.history.com

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This battle helped the U.S. gain a foothold in the region. This is significant because with the help of the U.S. , the Allies were able to defeat the Central powers. The Allies were ahead in the war because of fresh troops from the U.S. This was the first major engagement of the U.S. army in the World War 1.
https://www.historycrunch.com

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This battle started on June 6, 1918. This battle was significant because this was proving ground for Perishing's American Expeditionary Force. This battle was one of the most ferocious battles fought by American troops during the war. This battle was later destined to be the turning point of World War 1.
https://www.heraldbulletin.com

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The second battle of Marne involved the U.S. 

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This battle was considered the pivotal battle of the First World War. The Allies troops blunted the German advance and started the counteroffensive that would ultimately win the war. This is significant because this battle could determine the end of the war. The Allies won the battle and won the war.
https://www.history.com/this-day-in-history

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The Treaty of Versailles was supposed to consist of the 14 points by Wilson. This treaty ended World War 1 and established the league of Nations.  This was significant to the United States because it was their idea to create a peace treaty. Later the U.S. rejected the treaty because the U.S. thought the treaty was too harsh on Germany.
https://www.history.com

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After the war,the U.S. did not join the League of Nations because of the official leaders of the nation. This is significant because this caused the U.S. to go into isolation. The League of Nations failed without the United States. Without the Americans military, the League of Nations lost the ability to create a longstanding army.
https://en.wikipedia.org

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After the war, The U.S. entered isolation and wanted to be kept out of European affairs. This is significant because after the tragic deaths suffered from World War 1, the U.S. thought it was better to put their nation first instead of getting involved in another war. America's goal was to protect the nation from socialism and communism from Europe. This caused the U.S. to not join the League of Nations.
https://history.state.gov/milestones