The microwave
The Poison gas and the airlifts
Do you mean, "Why was the era AFTER world war 2 called the cold war?" Because no one calls the era of WW2 the cold war.
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The atomic weapon.
nuclear bomb
Late Edwardian era, the First World War era, and the Inter-war era.
The aircraft carrier was a new invention in World War I. The use of deadly gases was also a new invention in World War I.
New inventions changed warfare during World War 1 by creating new weapons and creating more casualties. Some of the inventions during World War 1 were tanks, infantry rifles, and machine guns.
Edwardian era or World War 1
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the atom bomb and the pop rivet.
In general, the same as in other wars of that era. Specifically, there was a great deal of trench-warfare. Chemical weapons were used. There were new inventions such as the tank and the fighter plane.