I know there are regulatory rules which partially explain the fragmented banking sector in the US compared to other nations: four example in Australia we only really have 4-5 proper banks Are there other reasons that small banks have seemed to thrive in the United States but no where else?
I would say the fact that banking is not something that is legally the authority of the federal government; even though states have seemingly acquiesced to their role and right eroding and being taken from them as the federal government persistently oversteps its bound and becomes ever more authoritarian. It’s something even most Americans don’t even understand anymore, let alone foreigners or immigrants; that the US…
But, IIRC, you can set up a bank absent checking services, wires, FDIC protection, etc. and operate entirely within one state. Good luck attracting customers.