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Polygonia interrogationis
The Question Mark (Polygonia interrogationis) is a North American nymphalid butterfly. They live in wooded areas and city parks, or generally in areas which feature trees and free spaces. The adult butterfly has a wingspan of 4.5–7.6 cm (1.8–3.0 in). Its flight period is from May to September. "The silver mark on the underside of the hindwing is broken into two parts, a curved line and a dot, creating a ?-shaped mark that gives the species its common name."
The white question mark like markings on the mid fore wing (outer) ID this as question mark.
Well done on getting both views of this lovely butterfly! If you look at the second photo you will see the small white "question mark" pattern that gives this species its name.