If such Germany demands Corridor, then war is imminent anyway, so is German-Soviet pact to ensure at least USSR's neutrality. Germans hated Poland much more than USSR, even right wing ones, and preffered 1914 borders over Polish buffer against Soviets.
Blah, blah, blah evil dumb Poles would destroy themselves blah, blah, blah...
If Germany invade Poland geopolitical domino would still fall same as OTL. UK & France have not declared war in Germany because of nazism, there were no death camps on 3 September 1939. They did it, because Germany...
Another Louis d'Anjou & Elizabeth of Bosnia family tree:
Elizabeth of Bosnia (1339-1387) m. Louis I (1326-1382) King of Hungary and Poland
1) Catherine (1370-1378)
2) Mary (1371-1433) Queen of Hungary, m. Sigismund (1368-1437) King of Bohemia and Hungary, Holy Roman Emperor
1) Elizabeth...
Rump state would be strongly opposed by Prussia & Austria, so for Alex it would be better to restore 1795 borders (with RE keeping just Białystok and Tarnopol). Bonus is, that Prussia and Austria would face serious troubles with their Polish population, especially the former, which within 1795...
Well, even hereditary monarchy like Sweden under Vasas saw 2 usurpations, GDL was usurped by Kazimierz Jagiellończyk against brother's will. And Polish nobles had to swear to Mary d'Anjou before, so nothing is guaranteed.
Take it into account: oldest son and intended heir (who even may be accepted as heir by nobles of all 4 realms or already crowned) of ATL Vladislaus III died not long before him. That makes succession more chaotic and split more likely.
OTL Władysław III practically lost Lithuania and neglected Poland after he moved to Buda. Such monstrosity would either collapse or monarch would barely be in control of most of his realm, having to ceede power to local councils. Casimir IV had seriuos trouble with Lithuania after he moved to...
Having multiple sons Władysław III would want to secure their future. Poland-Lithuania-Bohemia-Hungary moloch would be ungovernable anyway-it is receipe for eternal civil war. And IOTL Sigismund of Luxembourg was meant to split the thrones of Bohemia and Hungary if he had second daughter.
And...
Hedwig d'Anjou (1374-1399) Queen of Poland, m. Vadislaus II Jogaila (ca. 1360-1434) Grand Duke of Lithuania, King of Poland
1) Vladislaus III (1399-1445) King of Poland 1434, King of Bohemia and Hungary (as Ladislaus V) 1437, m. Elizabeth of Luxembourg (1409-1442) [1]
1) Vladislaus (1427-1444)...
Obviously, losing a war against his own subject is not something, that any ruler of the time could afford, let alone Nicholas I. Older brother really left him in situation without good options with dubious gift of Polish throne. Otherwise by mid 19th century (when modern Polish nationalism...