After World War II, immigrants came from various regions and countries, with different waves of migration occurring in different parts of the world. However, among the options provided, the answer is (a) Russia, Portugal, Germany, Poland, and England. These countries experienced significant emigration and immigration during the post-war period, with people seeking opportunities, refuge, or to reunite with family members in different parts of the world. It's important to note that this answer is not exhaustive, as immigration patterns after WWII were diverse and involved numerous countries and regions.