From what you said, I can conclude that historical events in the world are basically inevitable and they are bound to happen sooner or later. Well, with due respect to your idea, I think otherwise. I believe some major events in history could have altered or modified if we had had the science and technology to time travel.
However, I should admit that time travel is quite a remarkable feat as it requires an abundance of energy and access to state-of-the-art technology. On the basis of the Butterfly Effect, one minor and nominal change could yield outstandingly major changes in a nonlinear manner.