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US Cemetary for the Somme. Bony. FR

The U.S.A. joined W.W.1 on the Allied side after The Zimmermann Telegram had been decoded by British Intelligence. The telegram, addressed to the president of Mexico by the German Ambassador to the US, promised to assist Mexico in the annexation to Mexico of states in the southwest of the USA, from California to Texas, if Mexico would launch offensive operations against the USA. US troops joined Allied operations in 1918. US fatalities were some 110,000, 45,000 being due to 'Spanish Flu'.