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Describe how America's entrance influenced the outcome of World War I.
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America's entrance into World War I significantly influenced the outcome by providing crucial resources and strategic advantages to the Allies. The U.S. contributed approximately two million troops, along with essential supplies like food, money, and weapons, which resolved many logistical issues for the Allies. This influx allowed Allied forces to launch more coordinated attacks and defenses against German offensives, boosting morale and leading to strategic victories. Consequently, the U.S. involvement played a pivotal role in turning the tide against the Central Powers.
There are at least two good reasons why the entrance of the United States into the First World War helped turn its tide against the Central powers. The first is basic accounting. The United States brought men, material, and money the Allies desperately needed. The second reason is strategic. All that help the United States brought into the war gave Marshal Foch options.
Around two million men went to war for the US, and they brought with them horses, guns, food, and dollars. It's hard to overstate the effect this had on the Allies. It saved them, literally. Almost overnight, their supply and logistical problems evaporated. Field engineering works became possible on a much larger scale in a much shorter time. Troops ate and got medical attention much more reliably in the rear of the fighting line and at a much higher standard in most sectors. And the money to...
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pay for all this significantly boosted morale, especially among the supreme commanders and the middle-rank officer corps.
American fighting around Cantigny, Belleau Wood, and the Marne in early 1918 didn't win the war all by itself, but it let the British and French armies cope with German offensives at the Somme and Compeigne. Instead of having to take troops from one sector to attack or defend another, the Allies could now attack and defend everywhere. These overwhelming advantages in logistics and strategy won the war for the Allies.
One of the best ways to learn about the First World War is to listen to Dan Carlin's podcast series called Hardcore History—Blueprint For Armageddon. It's very well researched and presented. I highly recommend it.
References
Let me give a little context first. The United States did not want to enter WW I, but when German U-boats repeatedly sank non-warships, the United States formally declared war on Germany. As a side note, the Germans sank seven U.S. merchant ships. War was declared on April 6 1917.
At this time, the United States did not have a large army, but after the passage of the Selective Service Act, 2.8 million men were drafted. This was a huge influx of soldiers. Around 10,000 men were being sent on a daily basis to France. In addition, the United States worked it out with Puerto Rico to send Puerto Rican solider to the war as well. This meant more able men to replenish the war effort.
Another way the United States helped the war campaign was it sent ships. They sent battle ships and submarines to aid in the defeat of German U-boats and to reinforce the the naval defense.
Finally, all of this gave a huge spike in morale to continue in the war effort. In addition, this made the Germans more demoralized.