ronym, That is not true at all, rural areas would be in trouble after 7 days and rural areas will get the radiation. 1. All big cities in the U. S. have many nuclear power plants that if the cities were hit with a nuclear bomb each the radiation would go everywhere.
2. it also depends on the wind, It will take some big bombs to destroy the cities also the U. S would be sending nuclear bombs there way too! The world would see radiation all over.