premise: Poland lost a significant amount of territory after new borders were drawn up in the Yalta Agreement in 1945, including the eastern regions around Wilno (Vilnius) and Lwew (Lvov).
hypothesis: After new borders were drawn up in the Yalta Agreement in 1945, Poland lost a significant amount of territory, ncluding the eastern regions around Wilno (Vilnius) and Lwew (Lvov).