Exactly what the title says. If Joanna la Beltraneja was never born, avoiding all the War of Castillian Succession, how would it affect the Iberian kingdoms? Assuming that Alfonso - the half-brother of Henry of Castile -still dies in 1468 then Isabella becomes the only heir of the throne, but ITTL she wouldn't need a war to get it. Would she still marry Ferdinand of Aragon?