if that was so, then Albany NY would be too - what qualifies it as Seaboard is when it was settled and became a sea going destination - like London England
or Toronto Ont. or Chicago Ill. or even Duluth Minnesota or even Montreal Que. (Montreal is on the st Lawerence River which is the Seaway to Lower Canada. It is not
an ocean port. Like Philly - it's not a sea-port.