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[Game of Thrones] If Robb had won the war, how would he deal with the other threats?

Let's say the red wedding never happens. He lives. How does the rest of the war play out? who ends up sitting on the Iron Throne? and how does everything play out with Jon bringing wildlings through, Daenerys, and The White Walker threat?
gpt
Are we assuming the only difference is the Red Wedding?  If so, he never steps foot in the South again after reclaiming Winterfell.  Robb left the River Lords behind to guard their own lands and took his northmen north.  All the Iron Throne has to do is convince a few River Lords to switch sides, which won't be hard since Robb hasn't done a ton to keep the River Lords loyal.  Bracken will happily turn on Blackwood and the Freys have every reason to spit on the Young Wolf too.  The River Lords fracture and turn on one another while Robb works on driving out the Ironborn.  He is moderately successful, assuming the Bolton's don't try anything right away, but he can't easily slip past the Twins once the Freys turn on him, so he's never returning to the south to reunite with the River Lords.

Stannis finds the North more or less closed off to him.  He may even decide not to head North to save the Night's Watch, since there's little enough hope of winning them to his cause with Robb still being a factor.  Hopefully Robb gets his stuff sorted quickly enough to ride to the Watch's aid, because if not, the Wall will be breached and Wildlings will flood into the Gift and surrounding countryside.

With Robb cut off from the River Lords and them fighting among themselves, the few holdouts more or less bend the knee pretty fast.

Up north, the big question is will Robb go through with making Jon his heir or not, because that will certainly influence a ton of what happens with the Wildlings after.

Assuming the Boltons stay in line, eventually Robb would probably be swayed by Jon and the Night's Watch to try and do something about the Others, probably to no more success than Jon himself has had.  But Robb's dominion over the Riverlands was broken the second he forswore his oath to House Frey and let Theon off the leash to go to the Iron Isles.  Those two factors put him in a no win scenario.  He can't ask his northmen to stay in the south while the Ironborn run amok in the north, and he can't ask his Riverlords to go north to fight them away, so no matter what, his fledgling Kingdom is broken, even if he doesn't die at the Twins.  With the Twins having no reason to hold faith with him or House Tully, their turning of their cloaks is inevitable.