US banking is slightly easier, in the sense that one may be able to either go through the tortuous process of setting up your own bank, or buying a corporation with the requisite licenses and (ideally) existing customer base.
EDIT: Rogers Communications (a Canadian telecommunications provider) applied for a banking license in September 2011 and launched in 2013[1]. I believe the bar is somewhat lower for existing domestic/Canadian companies.
That said, once you get there, the sorts of things you're allowed to do as a bank are pretty staggering (but this tends to lead to efficiency, and in turn stability).
Added: There is a golden path to becoming a bank under the Federal Bank Act these days, and it generally includes becoming a creditor first. Much of the process is about waiting for nearly inevitable approvals.
The regulators in the U.S. will finally give in, but we're more likely to see a 'challenger' bank as a spin out of an existing bank over the next few years IMO.
N26 and other UK/European challenger banks are entering the U.S. market this summer, but they will not have a banking license.
[1] https://www.americanbanker.com/slideshow/rebirth-the-de-novo...