Shipping - excluding zone(s)

I am setting up flat shipping and want to make 2 zones: US and International.

I set up the US easily, but I'd like to make the international the rest of the world but exclude Italy and all of Africa because of postal difficulties. How is it possible to set an area and exclude something from it? also I notice Europe is a zone but Africa did not come up as a zone. So the basic question is how to set up International being world wide, but being able to exclude the US, Italy and all the African countries from it? This is also important over time as we find certain countries that may be troublesome for shipping, we would like to remove them from the list as well.

If I am able to do that, I am also curious, will selecting International for shipping prevent someone from places like Italy or African countries from being able to place an order?

Thank you for help in understanding!

Hi Nicolas,
Could I just set the Country instead of setting the Zone to
control my desire country to doing business?
If yes, am I need to delete all zone but just to keep the country I desire?
Thanks
Jade

Noted with thanks!
I will delete all the zone and just to keep the county I desired
to test soon.

Noted with Thanks!