World Peace is nothing but a fantasy.
"There will always be war as long as there are people to wage them"
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Warcraft 3 - Peace occurred, and should of continued to occur. Renewing hostilities at the start of WoW was retardedly stupid to start. There was no reason at all for a break down, and none was given in Vanilla at all.
BC - The Alliance from Outland wanted to fight Orcs and the Orcs wanted to check out their homeworld. Again stupid for the war to be on going. PVP vs Aldor and Scryers would of solved.
Wrath - Logical that the Horde and Alliance would be united against the Scourge. Hellscream coming into power would of made sense to a START to hostilities. Warsong Clan and Wrathgate would continue to build on this.
Cata - Garrosh starts a real war on the need for resources.
MoP - War reaches conclusion and ends. Factions return to allies. Battle Grounds become War-Games, and PVP becomes FFA.
Fixed it to better reflect what the Lore should of been.