What was the Post WWII Freedom Explosian?

I believe you meant to ask about the "Post WWII Freedom Explosion." However, there doesn't seem to be a commonly known historical event by that specific name. It is possible that you might be referring to a concept or a period of time associated with the aftermath of World War II.

To properly answer your question, I would need more context or clarification about what you mean by the "Post WWII Freedom Explosion."