A powerful underground Ukrainian nationalist movement rose in Poland in the 1920s and 1930s, led by the Ukrainian Military Organization and the [[Organization of Ukrainian Nationalists]] (OUN). The movement attracted a militant following among students and harassed the Polish authorities. Legal Ukrainian parties, the Ukrainian Catholic Church, an active press, and a business sector also flourished in Poland. Economic conditions improved in the 1920s, but the region suffered from the Great Depression in the 1930s. | A powerful underground Ukrainian nationalist movement rose in Poland in the 1920s and 1930s, led by the Ukrainian Military Organization and the [[Organization of Ukrainian Nationalists]] (OUN). The movement attracted a militant following among students and harassed the Polish authorities. Legal Ukrainian parties, the Ukrainian Catholic Church, an active press, and a business sector also flourished in Poland. Economic conditions improved in the 1920s, but the region suffered from the Great Depression in the 1930s. |