The first use of gas in a war was used in world war one.
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There were lots of new technologies used in World War I. Tanks, airplanes, modern machine guns, poison gas, telephones and radios are a few examples.
Of course (while not entirely new) the proliferation of the machine gun forced the type of warfare that ensued.
Various technologies were used during World War 2 such as:GunsTanksSubmarinesRadio CommunicationPlanesShipsBombsMissiles (prototpyes)Their is many many more list of technologies used in WW2, just think about the military uses today and it like that but less high-tech.
World War I is significant because it marked the debut of many new types of weapons and was the first huge war to benefit from technological advances in radio, electrical power, and other technologies
Cruise missles, ballistic missles, jet aircraft and rocket aircraft were all used by Germany, Britain introduced radar to warfare and nuclear weapons were employed by the US.