What happens when you conquer the whole map in Total War: Medieval 2?

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I would like to get some help about Total War: Americas Campaign.
I just finished a long campaign with New Spain in TW: Americas Campaign. Furthermore, I conquered all the regions and destroyed all but one faction (New France; they only have a few units and ships. I guess they didn't do well). When I finished conquering the last town, the victory screen appeared and I could only go back to the main menu.
I just want to ask if is there a possibility to continue playing (and destroying New France) or is that it?
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