The Great Potato war was a war that:
A. Never fuckin' happened.
B. I just made up because I was bored.
C. Will never happen.
D. All of the above.
The cause for such a war was that Latvia and Ireland are both potato, but Latvia disagrees. Ireland attempted to anschluss Latvia but was starving due to a lack of potato.
At the end of the day: don't argue over potatoes. The end.