eh just make sure you talk to your neighbors about certain things. You don't want one history to be like "we warred and fucked everyones mom" and then your neighbor is like "we had centuries of peace"
Aye don't worry, I will. Wouldn't make sense if I didn't!
Volk.....am I able to be.....dwarfs?
Spoiler
No
But if because of, say, population genetics and geographic location, like a jungle, that one of your nation's people's unique qualities is short or shorter height than normal, along with any other qualities that might be associated with it, like also perhaps xenophobia (if your people are isolationist as an example) or an affinity for warfare in terrain like their homeland, then sure? As long as it's not the only redeeming quality of your people and the only thing making your nation unique. I can already imagine somebody saying "Uhhh Germany but they're short and brown".
I can imagine somebody making a pygmy-like people perhaps, or basing their nation off of asia maybe where they might also adopt the quality of being shorter than usual (if only slightly). But no dwarves. Dwarfism (real dwarves) outside of fantasy is usually only encountered when there is a Genetic aberration (in this case mostly Ring Chromosomes). The probability of having a population that consistently has ring chromosomes that does not die off immediately or suffers from other ailments as a result of these genetic aberrations is virtually impossible.
Dwarves no, Pygmies/short-ish people perhaps. Inverse is also true; no Ubermensch or low-key Giants or "my population is extra war like because the men have 2 Y Chromosomes". Goes for everyone. In this specific case, Dwarves no.