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The Zimmermann Telegram as it was received. 

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January 17, 1917 British intelligence intercepts the Zimmermann Telegram.

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January 17, 1917 British intelligence intercepts the Zimmermann Telegram.

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This was significant because it was one of the major factors that drew the US into the war. It forced the US to become active in the war otherwise they would have to face threats from the Germans and the Mexicans. The US could no longer avoid war and had to meet it. Without the Zimmermann Telegram, US involvement would have most likely taken much longer.

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February 1, 1917 Germans reinstate policy of unrestricted submarine warfare. 

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February 1, 1917 Germans reinstate policy of unrestricted submarine warfare. 

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This was significant because it was another major cause of American involvement in WW1 as well as showing where America had allied itself with. The response to German unrestricted submarine warfare compared to British unrestricted submarine warfare and the blockades they both imposed showed who America had allied itself with. Furthermore, an incident with the Lusitania, a effect of German unrestricted submarine warfare, made the desire to go to war very strong among the public. Wilson could no longer avoid the necessity of going to war.

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An example of propaganda pushed out by the Committee on Public Information. 

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April 1917 Wilson establishes the Committee on Public Information (CPI)

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April 1917 Wilson establishes the Committee on Public Information (CPI)

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This was significant because it was one of the ways the United States could get people to join the war effort. The propaganda they pushed out was what enticed many young Americans to enlist in the military. Without this, the American army would not have been as formidable as it had been. The United States would not have been able to supply so many fresh troops in the war without the people they had enlisting.

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An example of restrictions put in place by the War Industries Board in an effort to conserve materials. 

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July 28, 1917 The War Industries Board (WIB) is created.

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July 28, 1917 The War Industries Board (WIB) is created.

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This was significant because this was how the government set up quotas, generated more income, and conserved resources that were in scarcity. They imposed rationing in order to save resources such as wheat for soldiers on the war front. Without these changes done by the War Industries Board, it would have been much harder to prepare the soldiers for war. The American soldiers would not have been as well prepared for battle as they were.

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A propaganda poster asking the American people to buy war bonds. 

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1917-1918 US issues war bonds to raise money for war effort.

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1917-1918 US issues war bonds to raise money for war effort.

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This was significant because this was how the US paid for the war without raising taxes, which had not been received well in the years before. It was a win-win situation for both the people and the government. Bonds and a slightly higher income tax generated all the income the government needed to fund the war effort. Bonds became one of the safest ways to invest and receive a return.

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A political cartoon about the Espionage Act. 

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Espionage Act (1917) and Sedition Act (1918) are passed.

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Espionage Act (1917) and Sedition Act (1918) are passed.

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This was significant because it was the government's attempt to silence people spreading anything negative about the war effort. An example of this was the case of Schenck v. United States, where Charles Schenck was imprisoned for spreading pamphlets pushing anti-war agendas. This case also created the "clear and public danger" test to determine when a state could constitutionally take away a person's free speech. Without these two acts, the government would have had a harder dealing with public backlash about the war.

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January 8, 1918 Wilson proposes his 14 Points to Congress.

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January 8, 1918 Wilson proposes his 14 Points to Congress.

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This was significant because it was the first attempt of the United States to enter foreign policy and politics. Up until this point, America had followed a policy of isolationism, allowing European affairs to be settled domestically. With his 14 Points, Wilson was pulling the United States into affairs that they had no real experience in. Most importantly, his proposed League of Nations would be the first attempt at a global alliance.

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Allied Forces during the 2nd Battle of the Marne. 

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July 15, 1918 - August 6, 1918 The 2nd Battle of the Marne.

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July 15, 1918 - August 6, 1918 The 2nd Battle of the Marne.

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This was significant because the US had provided a lot of troops in this battle that was decisive in ending the war. In total, the US had provided 85,000 troops and had 12,000 casualties during the campaign. The Allied win would be very significant in speeding up the end of the war as the Germans started to lose steam in the war. If the Germans had won the battle, it's very possible that World War 1 would have continued for much longer and may even have possibly had a different outcome.

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World leaders discussing the terms of the Treaty of Versailles. 

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June 28, 1919 The Treaty of Versailles is signed. 

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June 28, 1919 The Treaty of Versailles is signed. 

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This was significant because in the terms of the treaty the League of Nations was created, which brought the US into international affairs as part of a global alliance. It also heavily punished the Central Powers, which would create tension and dissent that would spark WW2, a war that the US was heavily involved in. Also, the ideas brought up in Wilson's 14 Points were completely ignored by the Allies, whose main concern was punishing Germany for the war rather than work to build international peace. This would lead to unstable international relations that grew worse and worse over time.

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American cartoon meant to invoke a sense of nationalism. 

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1919 America emerges as a significant world power in the aftermath of WW1

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1919 America emerges as a significant world power in the aftermath of WW1

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This was significant because the US became a significant global power that had a lot of influence throughout the world. They held military bases in strategic locations throughout the world that allowed them to protect US interests and keep control throughout the world. The US had been relatively unscathed from bombs compared to Europe, which meant their economy was also stable from not having to pay for repairs for the damages. Without their success in WW1, the US would not have as much influence as it did during WW2 and other wars that came later where they were essential.