E commerce country list

Is there a list of countries that is acceptable for an eCommerce country drop down list that complies with national security rules for countries not to do business with.  I could not find an official list anywhere yet I was informed that that is such a list.
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I did not find any thing at http://www.state.gov
brixtecAuthor Commented:
Neither did I.  however, my client insists that he wants to be protected especially as his website is politically affiliated.  I noticed that Amazon does exclude countries like Iran in their country listing when checking out carts.  I do wonder what list they may be using.  Any ideas out there?
brixtecAuthor Commented:
I did find this and it may be a good reference for anyone needing similar information as it is continuously updated: http://www.treas.gov/offices/enforcement/ofac/programs/ 

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