The USA entered World War I militarily in April 1917 alongside the Allies, as an Associated Power. The key components of the USA's entry into the war contributed to, but weren't the primary force that influenced the eventual Allied victory on the Western Front. There were other forces that played a more dominant role in influencing the Allied victory. Of these include the failure of the 1918 German offensives and the implementation of new tactics by the Allied commanders Foch and Haig during the following Allied counter-offensives. Similarly, during the peace-making process in the aftermath of the war, the USA's overall contributions were relatively minor; with the other key contributors (France and Britain) having far greater influences over the matter.

As the case with numerous historians, John Keegan believes that the key components of the USA's entry into World War I, which involved US troops actively partaking in the fighting...