A circle is drawn from the center of the United States (near Belle Fourche, SD).
It is 8300 km in radius (5157 miles).
What countries does it go through?
Only the countries that the 8300 km line goes through count.
For example: Belize does not count as it ranges from 3242-3482 km.
For example: Eritrea does not count as it is more than 8300 km away.
https://www.jetpunk.com/series/1943478/country-compass