The Alliance (Ally's) is one of two major political factions of the mortal races in Azeroth, its counterpart being the Horde. The Alliance consists of powerful cultures and groups bound not by desperation or necessity, but by their deep commitments to abstract concepts like nobility and honor. The Alliance was once also known as the Alliance of Lordaeron when its leadership was centered in Lordaeron. However, the Alliance was forced to move the bulk of its forces to Kalimdor and to the southern Eastern Kingdoms continents of Khaz Modan and Azeroth after the plague of undeath ravaged the Kingdom of Lordaeron several years ago. Although the remaining living nations of Lordaeron are not as strong as they once were, they have pledged their loyalty to the Grand Alliance with the hopes of becoming strong once again. Over the course of the years new members and races have joined the Alliance furthering its united strength.
The modern Alliance is the successor to the Alliance of Lordaeron, which was created at the behest of King Terenas Menethil II of Lordaeron and Lord Anduin Lothar of the kingdom of Stormwind following the First War, five years after the reckoning. The human, dwarf, gnome, and high elf races allied together to fight off the orcish Horde. The Alliance was formed after the humans' defeat in the First war. King Terenas Menethil realized that the Horde was too powerful to be stopped alone and called all the seven human kingdoms to join forces, this is how the Alliance was created. Later the other races of Azeroth, the Ironforge and Wildhammer clan dwarves, The gnomes of Gnomeregan and the high elves of Quel'Thalas joined the Alliance as well. After a long bloody war, the Alliance managed to defeat the orcs, free the lands of Azeroth and send the orcs back to the Dark Portal. The result of this war was considered the Alliance's greatest victory.
Results of the Second Evasion
Events of the Second Invasion led to an alliance with both the night elves and the Horde. The former became permanent, while the latter did not.The third war was the biggest crisis the Alliance had ever known, most of the human and high elf population of Azeroth was murdered by the scourge. With Arthas' betrayal the Kingdom of Lordaeron fell under the Scourge. Just has it seen as the end of humanity the remaining forces of Lordaeron Under the Command of Grand Marshel Garithos managed to retake Dalaran. backed by the Blood Elf's the Alliance Remnants managed to repel the Scourge in Silverpine Forest. At the same time Stormwind and Ironforge sent reinforcements to the Hillsbrad Foothills and repelled the Scourge in the Alterac Mountains. After that, Garithos decided to send troops to retake Lordaeron from the Scourge, from where he and the rest of his forces never came back. The forces of Stormwind and Ironforge did not sent their troops to help him. It is unknown why they refused to help him but it is suggested that they realized that such an act would be a suicide mission and therefor refused to send their own troops to the Plaguelands and offered shelter to the refugees of Lordaeron instead. During which time Jaina Proudmoore led other surviving humans of Lordaeron to Kalimdor, aligning herself on Kalimdor with the night elves and inviting them to join the Alliance. Joining forces with the Horde, Jainas' Forces and the night elves managed to defeat the Burning Legion's forces and save Azeroth. After that, Jaina reunited her new nation with Stormwind and the survivors of Lordaeron, and the night elves finally joined the Alliance.