Critically Discuss the Following Analogical Argument

Essay

Critically discuss the following analogical argument:
Economic sanctions simply do not work. As a weapon of international persuasion, they are about as effective as popguns.
The United Nations imposed drastic sanctions upon Rhodesia; they failed utterly.
We imposed sanctions upon Poland; nothing happened.
Our government has forbidden trade with Cuba for the past twenty-five years; Cuba goes its own way.
Most recently, the president has laid heavy sanctions upon Libya; our noble allies have pooh-poohed the effort.
You can count on the same kind of result if economic sanctions are imposed on North Korea.