User blog comment:Adventuretimegurl123/My Theory of the Mushroom War and why it happened/@comment-14830104-20130831223442

The war had to have happened at some point after1982, since that's when Cheers first aired, so you could be right about the time, though I personally think it was in either the late 90s or early 00s since Moe was around making things like BMO around then.