How Do I Ban All Foreign Countries From Viewing My Site?

[meissenation]

Don't mean to stir the pot from this thread, but to be blunt -- the turkish hacking ring that attacks my sites on a regular basis is annoying. Not to mention the foriegn spammers that register on my site just to spam their porno gambling websites. My site is a regional site to Michigan, United States so I don't see any reason why anyone from any other country would need to register. Is there a way to block all foriegn IP addresses that resolve to another country from registering/accessing my vBulletin website?

Also, is there a way to ban based on their email address? I noticed the turkish hackers usually use hotmail.(country domain) instead of regular hotmail.com, etc. While I know either of these cases wouldn't stop all of the hacking activity, it would definitely stop a lot of it.