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the Germans' use of unrestricted submarine warfare
Cultaral ties to Britain (traded with Britain and Allies more than the Central Powers) Germany's use of unrestricted submarine warfare Germany's Zimmerman Note to Mexico
There were no successful tactics that helped end the war, which includes gassing, and tanks. Germany realized it could not win the war when millions of fresh American soldiers were arriving in France. German forces were spent and there were no new reserves available.
America's close cultural and economic ties with Britain.
It increased America's economic ties with the Allies because British blockade of Germany caused American trade with the Central Powers to virtually cease.
During World War I, poison gas was used as a chemical weapon by both the Allies and the Central Powers. It caused horrific suffering and death among soldiers, leading to the development of international chemical warfare treaties. Key chemicals used included chlorine, phosgene, and mustard gas.
The Germans' use of unrestricted submarine warfare against the merchant and passenger ships lead to the United States joining allies in WWI. The US had not a chance fighting the Germans alone.
Chemical warfare in WWI caused skin and respiratory problems.
U.S. Entered World War I April 6, 1917 On April 6, 1917, the U.S. joined its allies--Britain, France, and Russia--to fight in World War I.
Battlefield
General Pershing caused tension with the Allies by delaying sending troops to Europe until they were properly trained.
Pearl Harbor