Answer:
Last time I got that question on Quizlet and the answer was INNOVATION.
The two example of modern military technology had the greatest impact on the course of world war 1 are the following:
1. Chlorine Gas. The used this during attacks to enemies. The smoke covers the face of the soldier and hide them from enemies.
2. Gas Masks. Used to protect from enemies.
The battle of Gettysburg was considered to be the "turning point" of the civil war