This is actually just a revision of this question in relation to this answer.
I ask "Does one need a master's in math before taking a PhD in pure math?" (And then applied to the US for this question)
Chris C's answer suggests that in the US, I may just go straight from a bachelor's in mathematics to a PhD in mathematics, but I don't quite have a bachelor's in mathematics. My bachelor's is in mathematical finance.
Edit: Sorry. I forgot to emphasize something. My bachelor's didn't have a thesis. I had a thesis in master's, but it was in mathematical finance. Will this be a problem? I was thinking math PhD programs in the US think students have some background in mathematical research.
A variety of areas throughout mathematics. And that answer of mine that you link was written for an audience completely unfamiliar with mathematical research - someone ready to pursue a PhD should already know what it says. – Nate Eldredge Apr 2 at 13:33