Does anything unlock after completing the grand campaign?

[Liberator]

Just wondering if its worth playing another 40-odd years of my Sweden short campaign as I've met the victory conditions for it, but I'd rather start another with higher difficulty (tried M/M as I wasn't sure how improved the AI was, but its too easy to win battles where you're significantly outnumbered. As for the campaign difficulty, not once did any faction seige any of my cities or ports)

If any other factions are unlocked for completing the short campaign then I may stick with Sweden for now and start a campaign with another faction in a few days.

Apologies if this question has been answered already, as I'm sure it must have been but I can't find any info on it.

I completed my Dutch short campaign yesterday.
I realized that I can play long campaign or world domination (now). I'm not sure if these were playable before, but if I would have noticed, I would have started with a long or a world domination campaign.