What effect did the use of trenches and new technologies during world war 1 have?

Warfare was far deadlier than in the past and resulted in enormous casualties.

He served as the General Secretary of the Central Committee of the Communist Party of the Soviet Union from 1922 until his death in 1953. In the years following the death of Vladimir Lenin, he became the dictator of the Soviet Union, by manipulating and terrorizing others in order to destroy his opponents.