Wormy: Ethnic definitions are a problem on Polands eastern borders. They are nearly no problem on the south, and definitly no problem to the north (Lithuania, Latvia) and west (Germany)
And Bukovina a priority 2? You know this wasnt even Polish IOTL?
Anyways, my map needs some explanation:
1. The maps border for the Brest region (really, that is the name the town is known as in English, if only for the treaty - I can understand he rest being in Polish, but that? I had to wiki first what city thats supposed to be at all
) is problematic, because I do think the city and its environs should belong to Poland, as a Belorussian Brest would make for awful borders and bad economical areas. OTOH, the border may immidatly run east to it. Hence my rough division of it
2. The Chelm area can be considered Polish coreland, and should be among Polands order 1 priorities - but OTOH the Ukranian claim is understandable due to demographics. So if Poland is forced to make compromises its at least possible to do it on that region. It should really be avoided, though. Hence the striping...
3. Poznan/Posen is priority 1. Even most Weimar politicans considered it a yellow territory for Germany at best according to the colour chart
and were more focused on the socalled Corridor. And it is a historically very important site for Poland, after all - historically definitely a coreland.
4. The "Vilnius Corridor" and Lemberg...err, Lviv/Lwow
city (if not surroundings) have Polish majorities, so that should be order 2 priorities... oh and I just see I miscoloured Suwalki, thats supposed to be priority 1 purple
5. If at the east is an USSR then Poland might want to have a bufferzone between it and its core territories. Thats considerably easier in the Belorussian than in the Ukrainian territories, though, as there has been very much less of a Belorussian national awakening. Hence my seperation of green and yellow like that, in which Green means "Go for it if theres an USSR" and Yellow "could also serve in the same fashion, but could also be problems). Trying to get near Kiev in any case is just asking for troubles, and to the east of Belorus Russia proper already starts, which would be even more trouble!
6. Theres no point in trying to gain East Prussia or Lithuania in its interbellum borders. That would just make for large, uncontent minorities. That would just be trouble, too. Also no need to start even a potential conflict with Latvia, so also no Dünaburg... err, Dyneburg/Daugavpils
7. Rutheno-Carpathia and the Bukovina would mean an unity of Russinian people, which could come to support Poland hence, but theres no need to actively pursue that.
8. Come on, taking Spisz and Orawa was really just dickish!
They were historically Hungarian and ethnically Slovakian, I think...
9. The Polish parts of Teschen should be tried to be gained, but its not worth a major conflict with Czechoslovakia, at least certainly not immidatly after WW1.
10. Upper Silesia... ah, thats a mess. The IOTL borders gave Poland only the outer parts of the industrial area. One can make an economical argument that the industrial area should be kept together, in which case Germany would be the owner more likely and more wanted by the local population. OTOH, the border could have well be some cities more west, to the favour of Poland. All in all I do certainly think Poland should make an attempt to get at least as much as IOTL, but more of it (and the Upper Silesian industrial area as a whole) only when it really practically falls into its lap.
11. The OTL remaining German lands and Danzig/Gdansk... same, really. They wouldnt be "trouble" for Poland, no more then it already had, and Danzig/GDansk would havea real use of course - but they were ethnically German, hence it really wouldnt be "ideal"
12. The Corridor should be tried to be gained, if the corelands are secure, simply due to the sea access. HOWEVER:
13. As you can see I copied the segment with most parts of the German border for smaller subdivisions:
a) The Putzig/Puck area should be gained for sea access, top priority, even if it ends up as an exclave.
b) Northern/Central Pomerelia has a Polish majority, even if we count the Kashubians as seperate, and most of the rest is indeed Kashubian. Hence definitly priority 2 - to be tried to be gained if the corelands are secure.
c) Bromberg/Bydgoszcz was before the war in majority ethnically German, including its surroundings. That, ah, changed IOTL after the war, but that was only due to a German mass exodus. Which I think is not ideal, and really, if only Bromberg remained German, then this wouldnt cut off Poland from the sea, so why not? Sure, its an useful extension of the Corridor, so if its a gift Poland has no reason to say no, but they shouldnt actively try to get it.
d)Torun/Thorn... now, thats a "corridor" both side want now
Poland should definitly try to gain it, but if it has to compromise Northern and Central Pomerelia is more important, hence why I included green stripes.
e) There was a German compromise proposal for borders in Posen Province, but to be honest, it was pretty ridicolous as it included mostly Polish ethnic territories. Getting Posen/Poznan itself should be the main priority for Poland, but really, if thats possible then it also should reject that proposal!
f)However, I do think there is room for small border adjustments in favour of Germany. This becomes muddled as in that region the cities and towns were in majority German, but the countryside in majority Polish, however I think it would have been possible to include some of those tows into Germany without it getting too much of the countryside, in particular Lissa/Leszno...
Oh and
14) Polish colonies and restoration of PLC borders is a pipedream. Trying to get those will only and in a world of hurt for Poland, and even if it is achieved it would hardly be ideal for the peope involved.