In my opinion, a missed opportunity in many AH scenarios which detail an alternate Treaty of Versailles.
https://en.wikipedia.org/wiki/Act_of_Tilsit
Upon the capitulation of Germany in November of 1918, disorder ensued both in Germany proper and in East Prussia, and among other things, this disorder was seen by the
Lithuanian minority in East Prussia as an opportunity to reunite with their brethren to the east, which had already declared independence as the Republic of Lithuania. A similar path as was done in Lithuania itself began - representatives from the Prussian Lithuanians appointed their representative organ, the Prussian Lithuanian National Council, which released the Act of Tilsit in November 30, 1918:
Reviewing that all that exists has a right to life, and that we, Lithuanians, living in Prussian Lithuania, make up the majority of the population of this region, according to the Wilsonian right to self-determination, demand the unification of Lithuania Minor to Lithuania Major. We all with our signatures promise to to help reach this goal with all of our capabilities.
The region that was supposed to be included is colored red
here.
However, this act really didn't go anywhere because of a number of reasons - the Western Powers didn't pay attention to it and only cut off Klaipėda Region, and many of the Prussian Lithuanians themselves saw no reason to join their eastern compatriots - that's what 700 years of separation does to a nation.
However, in an alternative Versailles, especially one where the Entente, or whoever is dividing up Germany, are much more harsh on their terms, I imagine that this Act would probably be brought up, perhaps alongside with giving southern East Prussia to Poland or something like that.
Thoughts?