<Tr> <Td> Demarcation lines (show) <Ul> <Li> Curzon Line (1920) </Li> <Li> Oder--Neisse line (1950--1990) </Li> </Ul> </Td> </Tr> <Ul> <Li> Curzon Line (1920) </Li> <Li> Oder--Neisse line (1950--1990) </Li> </Ul> <Li> Curzon Line (1920) </Li> <Li> Oder--Neisse line (1950--1990) </Li>

At the yalta conference in february 1945 the allies agreed to