Does this kind of time travel exist?
WARNING: If this question is off-topic or in any way a bad question for this site, please don't downvote it, but migrate it to where it belongs. I cannot find an adequate place for this question, but I would love to get a proper answer for it instead of many downvotes which would prevent it from being answered by those who are willing to answer.
Say you can't change the past which affects you, but you can change everything else. I think that that already exists. However, a crazy idea came to my mind.
Imagine if, for example in real world, you go back to the past, say year 1, but into a jungle which had no contact with the world you live in since the point in time to which you're travelling and the point where you have gone back to the past. Could it be possible to rebuild the whole world's technology, culture, politics, religion, everything by preaching about how the world should be to the tribes. They accept and you tell them you will come back and so you travel every 50 years towards the future to see if everything is okay and if the society hasn't screwed up. 183
You do so until you reach 2001 where you jump to 2018 and tell the tribes that they're ready to open to the outer world. Let's say that they cannot make any contact with the world due to spacetime restricting them from influencing anything that influences you until 2018 where you went back to the past in the first place.
So with your tribe, the technology is more advanced than that of the world you know. You have nanotechnology with blockchain AI microscopic cells that act like a "magic wand field" meaning that when you say "Food, spawn!", the particles listen to you and craft the food from subatomic particles and whatnot. So you start bringing forth awesome miracles and come to contact with your own world. Would they believe that you've invented everything before them? Would they abolish patents because you've "invented everything before them"? How would this happen? Say you also have powers to do with your world whatever you want. For example, wiping out all terrorists instantaneously or spawning food for every poor person or capturing the world elite to expose them to the world? Could you be able to cause world peace if you were genuinely fighting for world peace and if you had all the power to do it?
But most importantly, does such an idea already exist? 693