How did war in the trenches affect soldiers?

Trench warfare developed in response to improvements in weapons; The participants developed the trench system to provide defense against the enemy fires. Life in trenches had an appalling, monotonous schedule, intermittently interrupted by infrequent attacks. Trenches were usually flooded with mud and water, where dead soldiers lay with combatants. Many men killed in the trenches were buried almost where they fell, contributing to the spread of rats. Diseases such as dysentery, commonly acquired from contaminated water, was especially a problem during the first stages of the war.

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when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.