Any conquered wonder will generate no culture.
Since Brazil and Argentina are conditional , how much does my stability needs to be for them not to spawn ?
If Brazil/Argentina/Italy/any other conditional civ doesn't spawn, can they 're'spawn later on or are they out of the game completely?
Do you mean respawns or first spawns? Respawns cannot happen in empty areas.
But I think in any case there shouldn't be a spawn of those civs in case their core isn't settled at all.