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On May 7, 1915, the German submarine (U-boat) U-20 torpedoed and sank the Lusitania. 

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The sinking of the Lusitania was the most notorious and deadly of several German submarine attacks in early 1917 -- attacks that were a key factor in the United States' decision to abandon a policy of neutrality and enter the war.The sinking itself has also been the topic of controversy, including the possibility that the Lusitania was deliberately put at risk in order to drag the U.S. into the war and that the ship was carrying undeclared war munitions in her cargo

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When America entered the Great War, the number of women in the workforce increased. Their employment opportunities expanded beyond traditional women's professions, such as teaching and domestic work, and women were now employed in clerical positions, sales, and garment and textile factories.As wage labor supplanted agricultural labor, growing numbers of women entered the paid workforce while unpaid housework took on new cultural and economic significance. In a very straightforward way, the industrial revolution prompted women to enter the paid workforce.

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The Battle of the Somme was one of the largest battles of World War I, and among the bloodiest in all of human history. A combination of a compact battlefield, destructive modern weaponry and several failures by British military leaders led to the unprecedented slaughter of wave after wave of young men.The Battle of Somme was the main Allied assault during 1916. The British had nearly 60,000 casualties and, similar to verdun, at the end of the battle in December, there was no major breakthrough and each side suffered much loss.

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The Treaty of Versailles was signed by Germany and the Allied Nations on June 28, 1919, formally ending World War One. The terms of the treaty required that Germany pay financial reparations, disarm, lose territory, and give up all of its overseas colonies.The Treaty of Versailles is one of the most controversial armistice treaties in history. The treaty's so-called “war guilt” clause forced Germany and other Central Powers to take all the blame for World War I. This meant a loss of territories, reduction in military forces, and reparation payments to Allied powers.The treaty forced Germany to surrender colonies in Africa, Asia and the Pacific; cede territory to other nations like France and Poland; reduce the size of its military; pay war reparations to the Allied countries; and accept guilt for the war.

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The 19th Amendment makes it illegal to deny the right to vote to any citizen based on their sex, which effectively granted women the right to vote. It was first introduced to Congress in 1878 and was finally certified 42 years later in 1920.Granted women the right to vote; its ratification limited a movement for women's rights that dated to the Seneca Falls Convention of 1848. Although women were voting in state elections in 12 states when the amendment passed, it enabled 8 million women to vote in the presidential election of 1920

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Nationalism was a particularly important cause of World War I due to several key factors. For instance, it caused nations to build up their armies and led to increased militarism. As well, it created extremely high tensions in Europe in the decades before the outbreak of the First World War.The rise and spread of nationalism gave people a new sense of identity and also led to an increased sense of competition among nation-states.

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The American success at Cantigny assured the French that American divisions could be depended upon in the line against the German offensive to take Paris. The victory at Cantigny was followed by attacks at Château-Thierry and Belleau Wood in the first half of June.Pershing, gave the order that no inch of Cantigny was to be surrendered. Over the next 72 hours, the Americans in Cantigny endured seven German counterattacks, maintaining control of the village despite high casualties, with 200 soldiers killed and another 200 incapacitated by German gas attacks.

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To ensure adequate food supplies for our troops and war-torn Europeans, President Wilson established the U.S. Food Administration with an Executive Order on August 10, 1917. Led by Herbert Hoover, the U.S. Food Administration assured the supply, distribution, and conservation of foodPrimarily comprised of volunteers, the Food Administration encouraged American citizens to spread information about food conservation in order to aid the war effort. The Conservation Train, also comprised of volunteers, propagated the Food Administration mission via the Pennsylvania Railroad during World War I.

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he Department of the Treasury operates and maintains systems that are critical to the nation's financial infrastructure, such as the production of coin and currency, the disbursement of payments to the American public, revenue collection, and the borrowing of funds necessary to run the federal government.Treasury yields don't just affect how much the government pays to borrow and how much investors earn by buying government bonds. They also influence the interest rates consumers and businesses pay on loans to buy real estate, vehicles, and equipment

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Great Britain and Germany both greatly increased their navies in this time period. Further, in Germany and Russia particularly, the military establishment began to have a greater influence on public policy. This increase in militarism helped push the countries involved into war.