How was WWI different once the American “doughboys” arrived in Europe?

Although the first American troops arrived in Europe in June 1917, the AEF did not fully participate at the front until October, when the First Division, one of the best-trained divisions of the AEF, entered the trenches at Nancy, France. ... By July 1918, French forces often were assigned to support AEF operations.

Explanation:

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these conditions long with a short growing season made farming difficult.

explanation:

the north has a climate of warm summers and snowy cold winters. the terrain is rocky, hilly, and not good for farming.