The TL I'm working on has most of those things...
I'll post a map once I've finished editing it...
--
Anyway, how much of Portugal would survive? It is fairly mountainous, after all...
Of course it still gets pwned...
Would Brazil claim Portugal's empire?
The more I think on Spain the more I think they'd have survived relatively intact. The mountainous NW is where the brunt would have fallen and it is the least populated. The southern Atlantic coast should have been shielded from most of the tidal wave.
I think Spain would be less of vassal and more of an ally to France. As for Portugal I think it is screwed. Too much coastline and too many rivers for those tidal waves to ride up (which is where all the population lives anyway -along the coast and the rivers). Those that did survive probably fled towards Spain.
I'm still trying to figure out how Britain had such a large fleet remaining after the tidal wave. Wouldn't it have trashed the channel ports and those in the Irish Sea?