 Complete the following phrase:  Lviv Polish: Lwów was a multicultural city just before World War II, with a population of 312,231. The citys 157,490 ethnic Poles constituted just over 50 per cent, with Jews at 32 per cent 99,595 and Ukrainians at 16 per cent 49,747. On 28 September 1939, after the joint Soviet-German invasion, the USSR and Germany signed the 