I think it is a subject, because all sentences need a subject.
Answer:
The answer is "The National Security Argument".
Explanation:
Protectionism is a term used in economics which describes a country protecting it's industries from interference by import/exports and taxes from other countries so that they can continue to operate in the case of a war and provide a sustainable environment during that time for the people.
Protectionism has 6 arguments and the example given by Bertrand in the question is "The National Security Argument" which is the protection of certain industries and providing that they can continue to produce crucial things, without the help of other parties, such as petrol, clothing and food if there is a war.
I hope this answer helps.
The resolution of the plot is right after the complication. The real problem of the story. The resolution is the way the problem is fixed.
