Sang said:
- Charlemange - in addition to his real-life conquests- also conquered all of Spain and Portugal (including the Muslim-held provinces)
I'm not sure Charlemagne could manage that... He had tremendeous difficulty just to create the
Marcia Hispanica from what I understood. I thus doubt he could conquest Spanish lands South of River Ebro.
Sang said:
-Spain (and maybe also Portugal, optionally) was conquered by the Kingdom of France before 1942
Hum... I think something went wrong with the date you're talking about... Did you meant 942? Or 1492 maybe?
Having France assimilate the Spanish Kingdoms while they are still divided might be possible but it will require a lot of efforts. France will also have to concentrate its politics on its Southern frontiers...
Which doesn't really seemed easy to do since France's major opponents in its early history were the early HRE, which wished to resurrect Charlemagne's Empire, and the Angevin-ruled England, which controlled the wetsern half via Personnal Union (Normandy, Greater Anjou, Aquitaine) or Vassalage (Britanny). Though the latter didn't became a threat before 1154 and the coronation of Henry II, the former was often subject of quarrel because of the realms that once formed Middle Francia (Lotharingia in particular).
Sang said:
- Would it have a serious impact on later history, such as the Rise of Nationalism? Would distinct Spanish and Portuguese national idenities develop, or would they end up being completely assimilated into French?
The POD you propose might be too early to consider the Rise of Nationalism. The word itself didn't existed before the XIXth Century I believe and the movement itself started rather late in European History: the first stage probably started around the 1500s, when Monarchies were becoming centralized around their Kings. And even then, it wasn't as such in every country.
Also, a French/Frankish Iberia would definitely not look the same way as OTL Iberia. "Spanish" and "Portuguese" identities would definitely not look the same: they might even be nothing more than "Regional" identities in a Franco-Iberian Personnal Union scenario! In a sense, that would probably mean that they would be absorbed into French culture, but even then the ATL French might not look like there OTL counterpart.
Sang said:
- How much would be Spanish and Portuguese languages effected?
It's quite possible the Spanish, Portuguse and French language would be affected: the Spanish and Portuguse would be more Francified while the French might become more Spanish influenced.
An interesting possibility might be that Occitan (a language once largely spoken in Southern France that is now spoken only by a few of those southern people) becomes the main language of that Franco-Iberian Kingdom. After all, Occitan is some sort of hybrid language between French and Spanish.
Sang said:
- Would it prevent America from getting discovered?
It's rather irrevelant to ask that question in my opinion. Even if there is no Spain in the ATL, there might be a country that will play its role. My personnal opinion is that there will always be an ATL Chritopher Colombus seeking a Western Route to reach Asia and will bump into the American Continent. The date might not be the same as OTL, but I'm sure you would end up with America being discovered by Europeans.
Sang said:
- Would it end up provoking a Jihad against Iberia?
I don't know Muslim civilisations enough to answer that question. However, with a Christian power looking to conquer all the the Peninsula, conflicts might be more frequent with the Muslims.