Why do US sanctions fail?

Platypus

The USA seems to have sanctions against half the world, but they don't seem to have much effect. I've kind of wondered about this for a while, but I never got anywhere with it. Today I came across this article on Aljazeera which sheds a little light on the subject.

Why do US sanctions fail? Because a platypus isn’t a bird
by Aaron Schneider

Basically, all countries can be categorized as evolving on the left or right evolutionary branch. Sanctions can be effective against the countries on the right branch, but will be ineffective against countries on the left branch.