Analysis of information sources in references of the Wikipedia article "Evoluția teritorială a Poloniei" in Romanian language version.
Established as a kingdom in 922 under Mieszko I, Poland was united with Lithuania in 1386 under the Jagiellon dynasty (1386–1572) to become the dominant power in east-central Europe, enjoying a prosperous golden age.
Formally, Poland and Lithuania were to be distinct, equal components of the federation… But Poland, which retained possession of the Lithuanian lands it had seized, had greater representation in the Diet and became the dominant partner.
(Sept. 19, 1657), agreement in which John Casimir, king of Poland from 1648 to 1668, renounced the suzerainty of the Polish crown over ducal Prussia and made Frederick William, who was the duke of Prussia as well as the elector of Brandenburg (1640–88), the duchy’s sovereign ruler.
Zasadniczym i podstawowym powodem powyższej decyzji zapisanej w artykule 28 traktatu była konieczność włączenia do Polski obszaru linii kolejowej łączącej Gdańsk z Warszawą. (Motivul principal și fundamental al acestei decizii, înscris în articolul 28 al tratatului, a fost nevoia de integrarea a regiunii poloneze a căii ferate care lega Gdańsk și Warsaw.)
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(ajutor)A Western Ukrainian People's Republic was also declared in Lviv on 19 octombrie 1918. The ZUNR formally (and largely symbolically) joined the UNR
At its apogee, the Polish-Lithuanian Commonwealth comprised some 400.000 square milei (1.000.000 km2) and a multi-ethnic population of 11 million.
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