Tanks led to WW1 because it was a source to solving problems of trench warfare and because it was the best defense and offense vehicle in their time.
Machine Guns
Flamethrowers led to WW1 because they were a source to showering the enemy with burning liquid which would lead to their deaths and would flush most of the troops.
Submarines
Poison Gas led to WW1 because it was used to reduce the enemy's ability to react and respond, which would kill a lot of troops because this damaged the lungs. skin, and eyes.
Ariplanes
Machine Guns led to WW1 because it was devastating firepower to kill most of the troops on the field and because it was a modern weapon that helped many other countries to victory.
Submarines led to WW1 because it was a useful vehicle to go underwater to take out the ships that were fully armored with cannons, soldiers, and missiles.
Planes led to WW1 because they were useful to carrying supplies, dropping bombs/nucs, and it could get information from above seeing the other countries.
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