Comments by "Yazzam X" (@yazzamx6380) on "The Van Allen Belts Are Dangerous - But Didn't Keep Us From The Moon | Answers With Joe" video.
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The USA sent men to the moon for political reasons, that's how the extra funding was justified, it wasn't for science and it didn't need to be sustainable. Once Congress were fully satisfied that the USSR were beaten, the extra funding was withdrawn, ending the Apollo program.
No nation other than the USA, USSR/Russia and now China have built rockets capable of taking people into space, therefore that limits the choice to just 3 nations who could send people to the moon.
Such a mission requires building the largest and most powerful rockets in history to get a craft capable of supporting human lives to the moon and back.
The USA achieved that with the Saturn V rocket, sending men to the moon nine times from 1968 to 1972, and landing on the moon during 6 of those missions.
The USA now have the SLS to send people to the moon (inside the Orion capsule) and eventually Space X rockets will be able to replace the SLS.
The USSR built the massive N1-L3 rocket back in the 60s to get their cosmonauts to the moon, but unfortunately their rocket blew up during every test launch and so their manned moon program was effectively grounded, forcing them to eventually abandon that rocket and end their moon program.
Both Russia and China are currently designing rockets large enough to send people to the moon.
I hope that helps :-)
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