Category
page 11921 in Poland
Silesian Uprisings
three Polish armed uprisings in Upper Silesia 1919–1921
Upper Silesia plebiscite
1921 referendum on the German-Polish border through Upper Silesia
March Constitution of Poland
first constitution of the Second Polish Republic, adopted in 1921
Polish–Romanian alliance
series of treaties between Poland and Romania (1921–1939)
Polish census of 1921