system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Did Voldemort affect the rest of the world.

There are wizards all over the world, why was an alliance not formed and the Death Eaters dealt with? With enough country's wizards helping it wouldn't have taken too long.
gpt
I think that its implied that Voldemort was the start of something big.  He never hit Grindelwald's effect (which was World War II) but he had the potential to be a world wide threat.  Fudge tells the Prime Minister that his counterpart is speaking to the US President at the time the PM and the President were supposed to have a phone call.  

One of the main issues is Voldemort was selling something a lot of wizards wanted.  Having a tyrant isn't too different from having to hide your magic in a small enclave.  More day to day freedom is a great cause for many people, regardless of long-term implications.

But in the long-term the Salem Witches would have outfitted a Seal Team and other branches of the US military and the wizarding war wouldn't have lasted long at all had it gotten much worse.