Implications of banning countries ip

We have had several attempts on our server from a couple of countries in particularly.  I have banned the specific IPs.  But I prefer the idea of prevention

As we don't do business outside our own country, I am wondering if it is easier to ban all countries except our own for now.

I would appreciate any advice from any security experts on this.  Especially interested if there are implications, that I have not yet considered, if I do this
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debbieau1Asked:
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Dave BaldwinConnect With a Mentor Fixer of ProblemsCommented:
Though what you're doing is not a bad idea and may make it more difficult, anyone who wants access can use a proxy server in this country to visit you.  You won't be able to tell where they came from.
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debbieau1Author Commented:
Yes I understand that and thanks.  

I realise if someone is determined then it won't necessarily help.  I don't believe we have been specifically targetted, we are just more in the general path.  It's more someone just trying to get in where they can.   They haven't as yet, but I like to put up prevention where I can.

Thanks again for your input.

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Dave BaldwinFixer of ProblemsCommented:
You're welcome.  Yes, they're trying to break in just about everywhere.  You become a serious target if you have money or secrets, then they try harder.  Thanks for the points.
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