system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:If nuclear weapons are literally 1940s tech, why is it so difficult for nations to build them, 70+ years later?
gpt
Nations that do have nuclear weapons have a great interest in keeping other nations from acquiring them. A big part of the difficulty in making nuclear weapons is in the raw materials to do so, and the machinery to do so. Also, if you are trying to acquire nuclear weapons, and those nations with them find out about it, expect sanctions to hit your economy really quickly.