What if Maria Theresa married Charles III of Spain?

I've read a lot of threads discussing alternate husbands for Maria Theresa, usually Frederick II, but I haven't seen any about a marriage to Charles III of Spain. In 1736 Charles VI convinced Francis to trade Lorraine for Tuscany. Francis's mother and brother opposed the swap, and Francis had misgivings himself. So what if Francis refused to make the exchange, and in retaliation Charles VI calls off the marriage? Instead he arranges for a marriage with Charles III (currently Charles VII & V of Naples & Sicily) and restoration of the Spanish alliance seeing as how the British haven't honored theirs. What does TTL's Treaty of Vienna look like? What happens to Stanislaw Leszczynski and how is the territory in Italy divided? Will there be a War of the Austrian Succession? If Ferdinand VI doesn't have any children who will inherit the kingdom of Spain?
 
I've read a lot of threads discussing alternate husbands for Maria Theresa, usually Frederick II, but I haven't seen any about a marriage to Charles III of Spain. In 1736 Charles VI convinced Francis to trade Lorraine for Tuscany. Francis's mother and brother opposed the swap, and Francis had misgivings himself. So what if Francis refused to make the exchange, and in retaliation Charles VI calls off the marriage? Instead he arranges for a marriage with Charles III (currently Charles VII & V of Naples & Sicily) and restoration of the Spanish alliance seeing as how the British haven't honored theirs. What does TTL's Treaty of Vienna look like? What happens to Stanislaw Leszczynski and how is the territory in Italy divided? Will there be a War of the Austrian Succession? If Ferdinand VI doesn't have any children who will inherit the kingdom of Spain?
That can only happen if Luis of Spain survives.
 
That can only happen if Luis of Spain survives.

Why wouldn't Ferdinand VI be sufficient? He had children with his wife, so they might have had surviving children in another timeline. Plus Charles would probably have given up his right to the Spanish throne, or agreed that it not be united with Austria.
 
Why wouldn't Ferdinand VI be sufficient? He had children with his wife, so they might have had surviving children in another timeline. Plus Charles would probably have given up his right to the Spanish throne, or agreed that it not be united with Austria.
He would also be sufficient but he has to have children.
 
A match between Charles of Spain and Maria Theresa is pretty unlikely. His parents were interested in an Austrian girl for him but Karl VI was against that match so Charles married instead her first cousin once removed
 
A match between Charles of Spain and Maria Theresa is pretty unlikely. His parents were interested in an Austrian girl for him but Karl VI was against that match so Charles married instead her first cousin once removed

Feeling abandoned by Britain could lead Charles VI to reform the Spanish alliance of 1725. The Spanish would love the idea of getting a Bourbon on Austria's throne and Charles III would (probably) bring some Italian lands back with him for the Austrians.
 
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