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Founder of Polish People's Party "Piast" (PSL Piast) in 1913. He was the chief negotiator for Poland at the peace negotiations in Riga after the Polish-Soviet war (1920–1921). Minister of Foreign Affairs of Poland in 1921. Deputy to Polish parliament (Sejm) until 1930, he was also an important politician in the PSL peasant party factions (PSL Piast, PSL Jedność Ludowa, Polish People's Party "Wyzwolenie", Stronnictwo Chłopskie).
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