> Nearly every country in the world requires proof of citizenship to vote. How is the rest of the world dealing with this problem?

Most of those nations have a mandatory national ID, so everyone already has proof of citizenship. The US and UK are very much outliers in having vocal and successful resistance to the implementation of a national ID card.

It's still bizarre though how this plays out in reality.

In some places like Illinois, an ID is required to exercise the rights of people but not the rights of citizens (FOID required to bear guns, but ID not required for vote).

In places like Arizona, it's the exact opposite. You can bear or conceal guns without an ID but you need an ID to vote.

Vermont is the only state I know of with any consistency on lack of ID requirements that convey non-ID citizens to also have the right of people. You can conceal guns and vote without ID.

>Most of those nations have a mandatory national ID

And what are the fees for these IDs, something you conveniently are leaving out (hint: mostly not free)?