The Alliance Splinters
Unaware of the death cults forming in their lands, the leaders of the Alliance nations began to bicker and argue over territorial holdings and decreasing political influence. King Terenas of Lordaeron began to suspect that the fragile pact they had forged during their darkest hour would not last for much longer. Terenas had convinced the Alliance leaders to lend money and laborers to help rebuild the southern kingdom of Stormwind, which had been destroyed during the orcish occupation of Azeroth. The higher taxes that resulted, along with the high expense of maintaining and operating the numerous orc internment camps, led many leaders - Genn Greymane of Gilneas in particular - to believe that their kingdoms would be better off seceding from the Alliance.
To make matters worse, the high elves of Silvermoon brusquely rescinded their allegiance to the Alliance, stating that the humans' poor leadership had led to the burning of their forests during the Second War. Terenas fought back his impatience and quietly reminded the elves that nothing of Quel'Thalas would have remained if not for the hundreds of valiant humans who'd given their lives to defend it. Nonetheless, the elves stubbornly decided to go their own way. In the wake of the elves' departure, Gilneas and Stromgarde seceded as well.
Though the Alliance was falling apart, King Terenas still had allies that he could count on. Both Admiral Proudmoore of Kul Tiras and the young king, Varian Wrynn of Azeroth, remained committed to the Alliance. Furthermore, the wizards of the Kirin Tor, led by the Archmage Antonidas, pledged Dalaran's steadfast support to Terenas' rule. Perhaps most reassuring of all was the pledge of the mighty dwarven king, Magni Bronzebeard, who vowed that the dwarves of Ironforge would forever owe a debt of honor to the Alliance for liberating Khaz Modan from the Horde's control.
No corresponding in-game book.