Interwar Poland (1922–1939) thumb|left|Chorzów in the 1930s In the Upper Silesia plebiscite a majority of 31,864 voters voted to remain in Germany while 10,764 votes were given for PolandHerder Institut Following three Silesian Uprisings, the eastern part of Silesia, including Chorzów and Królewska Huta, was separated from Germany and awarded to Poland in 1922. Migrations of people followed. Because of its strategic value, the case of the nitrogen factory Oberschlesische Stickstoffwerke was argued for years before the Permanent Court of International Justice, finally setting some new legal precedents on what is "just" in international relations."The Seventh Year of the Permanent Court of International Justice", Manley O. Hudson, The American Journal of International law, Vol. 23, No. 1 (Jan. 1929), pp. 1–29, , In 1934, the industrial communities of Chorzów, Królewska Huta and Nowe Hajduki were merged into one municipality with 81,000 inhabitants. The name of the oldest settlement Chorzów was given to the whole city. In April 1939, the settlement of Hajduki Wielkie with 30,000 inhabitants was added to Chorzów.
Interwar Poland (1922–1939) thumb|left|Chorzów in the 1930s In the Upper Silesia plebiscite a majority of 31864 voters voted to remain in Germany while 10,764 votes were given for PolandHerder Institut Following three Silesian Uprisings, the eastern part of Silesia, including Chorzów and Królewska Huta, was separated from Germany and awarded to Poland in 1922. Migrations of people followed. Because of its strategic value, the case of the nitrogen factory Oberschlesische Stickstoffwerke was argued for years before the Permanent Court of International Justice, finally setting some new legal precedents on what is "just" in international relations."The Seventh Year of the Permanent Court of International Justice", Manley O. Hudson, The American Journal of International law, Vol. 23, No. 1 (Jan. 1929), pp. 1–29, , In 1934, the industrial communities of Chorzów, Królewska Huta and Nowe Hajduki were merged into one municipality with 81,000 inhabitants. The name of the oldest settlement Chorzów was given to the whole city. In April 1939, the settlement of Hajduki Wielkie with 30,000 inhabitants was added to Chorzów.