Poison gas, machine gun, tank, and submarine
Poison gas was a devastating weapon during WWI, grenades would emit gas, and anyone around it who did not have a gas mask on would be in terrible pain for the next few days until they died. Poison gas is still used today by militaries around the world and was a technological advancement at the time of WWI.
Machine guns would be set up in trenches to fire up to 600 rounds per minute, this was the dominant weapon of the war and was used to kill so many people during WWI. Machine guns are still used today and was a large impact during WWI as it was such a devastating weapon.
Tanks were new during WWI, and they ended trench warfare. Tanks were
The submarine gave a large advantage to the Navy, as it opened up under water warfare. The submarine found its first success in WWI,