Multiverse
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If there are multiple countries on the planet Earth, that must mean there's a country where the other countries don't exist.
I think that's North Korea
You spelled United States of America wrong.
Most Americans acknowledge the existence of other countries, that just refuse to believe those other countries have access to electricity, plumbing, or the internet.
Other countries exist, they just belong the United Empire.
Infinite countries. Which mumblemumble clearly makes it all work.