>>33343
>backwards time travel
You are gonna have to work really hard to make this story not retarded, going forward in time is doable, but back in time is almost impossible.
The future humans made our civilization? Then where did the future humans come from? Did they naturally develop over thousands of years? Did they have an entire history independent of ours? If so, then how is there a Communist Chinese Party, something that only exists because of western civilization? If they've been influencing the past, to the point that western civilization only existed because of them, how have they not wiped themselves out already?
And if you can travel back in time, whats stopping someone from going nuclear and destroying humanity at all points in time? Hell, just sending one nuke back on a timer to the middle of an American city would probably fuck things up beyond repair. And what the fuck, they gave us wheat and corn? It only existed because of their technology? And pray, how did they get that technology without food products like that? Why would they send them back? Genetic modification of maize into corn happened in less than a couple hundred years by people without laboratory technology, what do you think really goes into that?
The guy won't exist if he tries to stop them? Why? Because then nobody will send back the shenanigan for him to dedicate his life to? Option A, he exists, but now as a normal person who hasn't dedicated years of research to this retarded story. Option B, he continues existing, but with no memory of what he's been up to. Option C, by doing so, he enters a new timeline and continues existing in a future that is now devoid of Communist time travellers, but where the memory of their existance remains.