At first glance I thought it was a scarce swallowtail, but you don't have those in the USA, and there are a few differences in the markings. Maybe a tiger swallowtail?
Anyway: butterflies are having similar problems in Europe. No good will come of this.
I'm thinking that it might be a Western Tiger Swallowtail but I'm far from an expert in identifying butterflies. It is fun learning more about them.
Something seems to be tough on butterflies and other things, I do hope it turns around soon.