Leaders of the Seneca Nation have voted to rescind a 1954 agreement that allowed the New York State Thruway to run through the Cattaraugus Indian Reservation south of Buffalo. “The agreement is declared null and void,” Maurice A. John Sr., president of the Seneca Nation, said yesterday. The nation’s tribal council passed a resolution on Saturday arguing that the agreement, which allowed construction of three miles of the highway on Seneca land, is invalid because it was never approved by the secretary of the interior.