has anyone made a flag for this yet? or is this the leading candidate?

Plus flag. 

➕ = new
🏴 = country

So, the plus flag means starting a new country.

the black flag is the symbol of anarchy, not “country”

I think you can do greater-than-the-individual systems of order in a way that doesn’t cause a desire for recentralization: namely, through voluntaryism (and the tech that enables ultra-consensual organization). 

“Countries” optional.

Thesis: over-centralization causes breakdown, resulting in anarchy

Antithesis: anarchy causes desire for recentralization

Synthesis: from anarchy, new countries