Geoffrey S. Mendelson wrote:

Exactly which countries besides the U.S. have allowed it after testing it?

Geoff.

I am afraid I "hear" that question as:

1) Exactly what countries developed the A-Bomb, before the USA?

2) Exactly what countries developed the desktop computer, before the USA?

3) Exactly what countries walked the Moon, before the USA?

4) Exactly what countries had "real" stealth aircraft, before the USA?

5) Etc., etc. ...

If we waited for other countries, we'd be in real trouble now, wouldn't we?

Regards,
JS