To begin, it didn't promote "peace" as much as it promoted a "cold war" which is the whole point of the name, Cold War.
Nuclear Weapons essentially forced the US and the Soviet Union into an uncomfortable draw.
They knew they couldn't fight each other directly so they fought each other in a series of devastating proxy wars around the world.
Because its an everyday thing. Its not something new
Answer:
Hydrogen
Explanation:
It was the easiest atom to form (one proton and one electron). Hope this helps!
Answer:
Britain
Explanation:
June 1940 it was the last to stand against Germany
