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A German U-boat torpedoed the British-owned steamship Lusitania, killing 1,195 people including 128 Americans, on May 7, 1915. This is significant because the disaster set off a chain of events that led to the U.S. entering World War I.

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U.S declares war on Germany: April 6, 1917

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U.S declares war on Germany: April 6, 1917

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Americans entered the war in 1917 by declaring war on Germany. This was due to the attack on Lusitania, the unrestricted submarine warfare on American ships heading to Britain, and Germany encouraging Mexico to attack the USA. This is significant because it tied to the sinking of the Lusitania which was one of the leading factors of the U.S involvement in WWI.

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Propaganda posters were significant because it sought to rally the fighting spirit on the home front, raise money for war bonds, and create a sense of togetherness across a vast and diverse nation. They evoked sympathy for the cause of the war and sought to make it appear less gruesome.

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American loans are significant because they would mobilize large sums of money from the public. Governments publicized the war loans as patriotic contributions to the war effort; a financial substitute for serving in the field. Also, Liberty Loans helped fund the war.

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The telegram was significant because it coupled with American outrage over Germany's resumption of unrestricted submarine warfare, which were one of the tipping points persuading the U.S. to join the war.

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In June 1917, two months after the U.S. entered the war against Germany, Congress passed the Espionage Act, which is significant because it prohibited speech that incited military insubordination or the refusal to serve in the armed forces. The Sedition Act of 1918 reduced the free speech rights of U.S. citizens during time of war.

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President Roosevelt settled on two major means of raising money: increased taxes and borrowing, through the sale of massive amounts of war bonds. Besides paying for the enormous costs of war, these measures would remove excess wages and other spendable money in a time of shortages, helping to keep a lid on inflation. This is significant because it financed the United States government's participation in World War I.

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The Committee on Public Information (CPI) 

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The Committee on Public Information (CPI) 

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The Committee on Public Information (CPI) fed material to newspapers and magazines, commissioned advertising campaigns, and produced propaganda posters. It even arranged for thousands of public speakers to appear all over the country, making the case for Americans to fight in Europe. It was significant because the response to the U.S. entry into World War I in an attempt to mobilize public opinion behind the war effort with every available form of mass communication.

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On July 10, 1919, president Wilson, for the first time since 1789, personally delivered a treaty to the Senate. The Treaty of Versailles is significant because it appelled the U.S, ending World War I and establishing the League of Nations.

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During WWI, manufacturing and other industries mobilized for war production experienced the worst labor shortages because of the war effort. This is significant because following the end of WWI, labor demand from manufacturing sectors declined, but labor demand from service sectors increased.