How could we make Poland have these borders, the POD is after the Collapse of the Russian Empire.
You missed none, it has all ethnic polish regions in Poland.I might need some more context; it's somewhat difficult for me to place which regions are in this Poland. I can see Greater Poland, the Corridor, Congress Poland, I think Upper Silesia, and West Galicia; how much south and east of WG is there, and how much to the east of Congress Poland? And is there anything I've missed?
You missed none, it has all ethnic polish regions in Poland.
Looks similiar to 1914 map of one of Polish cartographers - it was a map of proposed after-WW1 autonomic Poland. As in your map (probably; tip: use more geographic features next time - it's a bit hard to tell what territory your map covers) proposed Poland included Danzig, southern East Prussia, all Upper Silesia (including Opole), western Galicia & Bialystok Oblast, with northern East Prussia (including Elbing), eastern Galicia, Suwalki and Chelm Governorates being in Russia proper.
It definitely doesn't include Danzig, that little bite taken out of the corridor in the northeast is the Free City's space on OTL maps.
Well, there is no Vilnius region and one could attempt to make the case for the rest of Galicia, but in the West there seems to be no omissions.What exactly does it lack?