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On May 17th A German boat torpedoed a British owned boat called the Lusitania. Killing around 1,195 including 128 Americans. This immediately caused tension between the country of Germany as well as United States.

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the Zimmerman Telegram was A key point to the U.S joining the war because. They felt as a nation that Germany was sending them a threat Due to Germany actively trying form an alliance with Mexico to attack the united states.

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This was the largest war that american troops were sent to with over a million soldiers being deployed into battle.This war was fought through 9/26/1918 - 11/11/1918

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On 4/2/1918 The General known as John J Pershing had american troops sent to aid and defend the German offensive war actions,This was one of the first major deployments of the U.S entering WW1. These american troops fought along side Britain and France In the second battle of Somme.

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In the source it states "In the four great offensives from 21 March to 13 June 1918 the Germans gained considerable ground, but failed to achieve a decisive advantage at any point on the front. Furthermore, success was bought at a price in manpower and material which they could ill afford. Their more then 600,000 casualties were irreplaceable, whereas the Allied loss of some 800,000 men was soon more than compensated for by new American units arriving at the front in ever-mounting numbers. By July 1918 Allied troops outnumbered German on the Western Front. Other factors also contributed to the decline of German morale, notably the pinch of the blockade and the effectiveness of the Allied propaganda, which was distributed widely by air at the front and in German cities behind the lines. But Ludendorff refused to consider peace negotiations, and planned two more offensives for July which he hoped would bring victory. The first of the new drives was designed to capture Rheims, to make more secure the supply of the Merge salient, and to draw in Allied reserves. The second and larger offensive, destined never to be launched, would strike once again at the British in Flanders.  The attack west of the city succeeded in pushing across the Marne near Chateau-Thierry, but was checked there by French and American units. Among the A.E.F. units involved in this action were the 3d, 26th, 28th, and 42d Divisions, the 369th Infantry, and supporting elements (in all about 85,000 Americans). It was here that the 38th Infantry of the 3d Division gained its motto, "Rock of the Marne."

"https://history.army.mil/html/reference/army_flag/wwi.html#champagnemarne

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In the source it states "In the next few days the Germans sought to exploit and expand the deep and exposed salient which they had established. But by 4 June they had been stopped everywhere. Some 27,500 American troops took part in the check of the German advance. The 3d Division foiled enemy attempts in the period 1-4 June to secure a firm bridgehead across the Marne at Chateau-Thierry. West of the town the 2d Division, which included a Marine brigade, defended the road to Paris, and on 6 June successfully counterattacked in Belleau Wood." https://history.army.mil/html/reference/army_flag/wwi.html

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In the source it states "By September 1918, with both the Marne and the Amiens salients eliminated, there remained but one major threat to lateral rail communications behind the Allied lines-the old St. Mihiel salient near the Paris-Nancy line. Active preparations for its reduction began with the transfer of Headquarters First Army, effective 13 August, from La Ferté-sous-Jouarre in the Marne region to Neufchateau on the Meuse, immediately south of St. Mihiel. On 28 August the first echelon of headquarters moved closer to the front at Ligny-en-Barrois. American unite from Flanders to Switzerland were shifted into the area near the salient. The fourteen American and four French divisions assigned to the First Army for the operation contained ample infantry and machinegun units for the attack. " https://history.army.mil/html/reference/army_flag/wwi.html

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In the source it states " Before its entry into World War I, the United States of America was a nation of untapped military potential and growing economic might. But the war changed the United States in two important ways: the country's military was turned into a large-scale fighting force with the intense experience of modern war, a force that was clearly equal to that of the old Great Powers; and the balance of economic power began to shift from the drained nations of Europe to America. However, the dreadful toll taken by the war led U.S. politicians to retreat from the world and return to a policy of isolationism. That isolation initially limited the impact of America's growth, " https://www.thoughtco.com/consequences-of-world-war-one-1222033

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In the source it states " The collapse of Russia under the pressure of total warfare allowed socialist revolutionaries to seize power and turn communism, one of the world’s growing ideologies, into a major European force. While the global socialist revolution that Vladimir Lenin believed was coming never happened, the presence of a huge and potentially powerful communist nation in Europe and Asia changed the balance of world politics.Germany's politics initially tottered toward joining Russia, but eventually pulled back from experiencing a full Leninist change and formed a new social democracy. This would come under great pressure and fail from the challenge of Germany's right, whereas Russia's authoritarian regime after the tsarists lasted for decades." https://www.thoughtco.com/consequences-of-world-war-one-1222033

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Nationalism Transforms and Complicates Europe

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Nationalism Transforms and Complicates Europe

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Nationalism Transforms and Complicates Europe

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In the source it states " Nationalism had been growing in Europe for decades before World War I began, but the war's aftermath saw a major rise in new nations and independence movements. Part of this was a result of Woodrow Wilson’s isolationist commitment to what he called "self-determination." But part of it was also a response to the destabilization of old empires, which nationalists viewed as an opportunity to declare new nations. The key region for European nationalism was Eastern Europe and the Balkans, where Poland, the three Baltic States, Czechoslovakia, the Kingdom of the Serbs, Croats, and Slovenes, and others emerged. But nationalism conflicted hugely with the ethnic makeup of this region of Europe, where many different nationalities and ethnicities sometimes lived in tension with one another. Eventually, internal conflicts stemming from new self-determination by national majorities arose from disaffected minorities who preferred the rule of neighbors."
https://www.thoughtco.com/consequences-of-world-war-one-1222033