I'm thinking:

[b][u]Banana Republic[/u][/b]: 1970-1980's style Latin American military junta on the verge of a zombie outbreak. ([b]1 Vote[/b])

[b][u]Mr. President[/u][/b]: 2020 North American-esque country during a zombie outbreak.

[b][u]Osteria[/u][/b]: 1100's High Ages Medieval Europe-esque country during a zombie outbreak. ([b]1 Vote[/b])

Or could do one where everyone has their own country, but I cannot see this being quite as fun.