The microwave
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.
The Poison gas and the airlifts
Late Edwardian era, the First World War era, and the Inter-war era.
The atomic weapon.
nuclear bomb
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Edwardian era or World War 1
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.
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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.