OP kinda has a point, at least when Amarr bias is factored in.
Caldari mining corps are Poksu Mineral Group, Deep Core Mining Inc and MineDrill, all of which are State-only.
Gallente have Astral Mining, Material Acquisition and Allotek Industries, same thing.
Minmatar have Minmatar Mining Corporation, Vherokior Tribe and (kinda) Thukker Mix, the latter of which will shoot anyone who primarily missions for Amarr, Caldari and Gallente. Besides the Thukkers being in Derelik and Syndicate, they’re all similarly local.
Amarr have HZO Refinery, Ducia Foundry and Joint Harvesting. HZO is a local Domain-centered mining corp, but the latter two are multi-national. Funnily enough, most of DF’s international stations are in Gallente space, and JH’s obviously in Minmatar space.