B) 1939, after something happened which i forgot the event, but that's the date
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.
"<span>C) It held homesteaders responsible for contributing to the completion of the transcontinental railroad" is not true, since the act had to do only with land acquisition.
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