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POD: Mary of Burgundy marries Ferdinand of Aragon instead, Isabella marries Maximilian, Castile is drawn into the Habsburgs while the Burgundies become Trastamara. Spain remains disunited for longer, and Portugal becomes a contender for Uniter instead. The Iberian rulers end up haphazardly semi-colonising Europe - Castile has Austria (Bohemia and Hungary too, if Pressburg goes as OTL), while Aragon has the various Burgundies.

So, let's say that things don't work out between Spain's Golden Couple. Ferdinand marries... say, Mary of Burgundy instead, uniting the Aragonese possessions and the Burgundian inheritance, while Isabella marries, er, well, Maximilian would be around at the moment.

So, Castile is now Habsburg, in union with Austria while Burgundy is resolutely Trastamara. How does this change things?
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