There are a total of 39 U.S. WW1 Guns (1917-1918) in the Military Factory. Entries are listed below in alphanumeric order (1-to-Z). Flag images indicative of country of origin and not necessarily the primary operator.
Small arms such as hand grenades and mortars are also included in this listing.
NOTE: The United States declaration of war against the German Empire came on April 6th, 1917 and the country was not an official component of the Allies during the war, choosing to remain an independent power diplomatically though cooperating directly with Allied offensives and such.