We can hear by historians and politicians that

You have a unique perspective.  While many people believe that the future is predestined, I have never heard anyone say that what has occurred in the past was unavoidable.

While I don't put much emphasis what politicians say about the past, since they tend to pick & choose whichever references will make them appear more righteous in their rhetoric, I do believe that societies and sometimes individuals have made decisions that altered the course of history.

For example, I once heard that Adolf Hitler's mother had considered abortion when she was carrying him.  Had she done so, would WWII have happened?  Was the world ripe for that kind of conflict & carnage and would someone else would have taken Hitler's place?  Or was he a dynamic, integral part of the equation?

While I won't say that every historic event was a coin toss, or that every decision that someone makes affects the timeline, I do believe that many things could have happened differently...or not at all.   

Being a teacher and student of history, government and ecnomics I will try and give you my point of view.

Your are to heavy on the philisophical . Human nature has not changed since the beginning of time. What has changed has been the external forces that cause man to act. Those forces have advanced mankind in some cases and retarded him in others. What is sure is that since the beginning of time man has reacted to those forces.  Long before the written word those reactions were passed on by word of mouth only to be written at a later date and varified or disclaimed. With the establishment of the written word nothing changed only the method of varification and changes do to mdernization. But human nature did not change, like the written word it only advanced through modernization.

Wars today are fought the same way and for the same reasons they were fought under Alexander and Nepolean. The things that have changed are the tactics and method of killing due to moderization and trial and error. The development of mankind is the same thing, modernization. There was modernization in 500BC and 500AD, 1400AD and 1800AD as well as 1900AD and the new milliniam. All of mankinds advances have been recorded nothing that was done has gone unnoticed and unrecorded. It is those records and varifications that have made life what it is today. Any advancemants have come through the knowledge of the past there advances and changes, trial and error. What will come in the future or the present

will be through the knowledge of what has come before and new ways of doing it. Do not get me wrong there will be new developments but they will come through the adaption of the old and changes through modernization, trial and error.

HIstory, Politics and Economics have been around since man fought his first battel, governed his first city and made his first purchase. What has come since was all done before it is only through moderization and inovation that things have changed. But all is based on what came before. To answer your question "NO". 

No, history, past politics and past economic happenings are not predictions. Many if not all ( leave out Nostrodamus) predictions of history, economics and politics are based on past events. There is no one way over the years as I said everything has been done at least once, one way and through hindsight, trial and error and the presence of many different variations they have been done again, again, and again.

I feel you have missed the point of my answer. Let me try and make it clearer. You can never dismiss anything because it been done already. IT HAS "ALL" BEEN DONE BEFORE. It will be done again but through trial and error, variations and hindsight making it different from the last time. Oh yes then there are the revisionists who try to remake history, politics and economists that try and change (not by common sense) but by saying it did not happen that way and the winners were not winners by actually loosers.

It is at this point you should get into the act. At this point you have to decide on wether to do it again with the changes or just sit back and wait for the next guy.

For the last time. I follow your question you do not seem to understand what am I saying. ONE MORE TIME. Nothing that is happing today is new. It has all happened before in one way or another, to answer your last statement. Such speculations have happend as you say it is called MONDAY MORNING QUATERBACKING. And because of it, trial and error, variations, modern implimentations it will happen again. It will always happen again because of thinkers who are not affraid to try it again but avoiding the errors of th efirst time. Things never have been just one way and stopped, man the thinker who is always trying to do it better will do it. That is your human nature. I hope you get it now.  

I think that the past should be possible

Historians and politicians had better do now and then and with cautiousness, and not eventually be immoderately dumbfounded on it