The United States is the country that sells the most oil.
Malaysia
china
Japan
US
The United States sells the most burgers. America is obsessed with fast food.
Canada.
czechoslovakia
australia
Eating prawns should not cause a migraine unless you have an allergy to prawns, in which case it is possible (although that is not the most usual type of allergic reaction).
Prawns, in one shape or another, live in pretty much every ocean of the world. There are even some freshwater species. It's impossible to claim that they came from one particular country.
Must be the USA.