For you why did fascism emerge in the first place
That's a broad question that has different answers depending on the time and place. There's no single answer to this.
why did it re-emerge nowadays.
Again, it's a broad question with different answers. However, I can definetly say that social media and selection bias play a role in pushing the average person to extreme views such as yours. Which is why I'd like to remind people to take a break and cool down every once in a while.
That would be a geopolitical disaster for the US. No matter how much he yaps his mouth around, Trump doesn't want the EU as an adversary. If that were to happen the US would have 2 flanks to defend against instead of one. And the EU is not Russia. Collectively the EU has the second biggest military budget and the third biggest economy in the world.
Trump is trying to get us to increase centralization at the EU level which is great as far as I'm concerned. But that chucklenut is doing it in a way that will also massively sour relations in the long term. As insane as it sounds, if Trump's successor is going to be like him, China will probably be a more reliable partner than the US. The only caveat is that Taiwan is going to be extremely vulnerable in such a situation.
I'm hoping the US will come to its senses at the next election and relations will normalize. The Americans are pricks, but they are still more ideologically aligned with us than the Chinese.