Thousands of years in the futures space was colonized, planets terraformed, history happening upon those planets and so forth. But it's not quite as was predicted, for in the initial foray of interstellar colonization gravity manipulation was invented, and then made in such as way that the core of a planet could be altered, which on top of being ignited and molten, could alter the gravity of a planet by slowing down or speeding up time on the surface.
For example, with the rate, time was slowed down multiplied by the observed gravity on the surface prior to the alteration and speed up gravity doing the opposite. Eg, Mars, with gravity doubled, has time from the reference frame of those living on would experience time moving half as fast as on earth, with the wavelengths of light received halved, and so forth.
And so humanity spread out to the stars at near light speed, all sorts of worlds blossomed, but the time rate of passing varied greatly from world to world. All sorts of worlds, sometimes in the same solar system, with drastically different time rates passing.
Generally, now that this is set up, what would be the BROAD social effects of living in a world with, A: Resource cheap near light speed interstellar travel, and B: The various worlds settled having time pass at potentially drastically different rates.
To clarify, I'm not asking what specific cultures would emerge, though I'm not going to stop you from adding that, but rather what are the general social structures, cultural effects, that would or might emerge as a result of such a setup.
Extra information People have lifespans of around 300 years
The nearlightspeed ships use warp drive, so no nearlightspeed ramming, the warp bubble would collapse in atmosphere
Assume, barring ftl and with cheaper nearlightspeed travel the level of technology would resemble that of alien, barring the reteofuturistic parts, which would be a more advanced version of modern technology. (So no Star Wars holograms, for example)
TLDR: A Future interstellar cargo ship would be as expensive to field as a modern cargo ship
The technology is understood by humans and has been improved upon by humans, but was initially invented by ai.
All geopolitics on the planets is as a basis, based on the nation's of earth, so United States colonies, china's colonies, eu colonies and so forth. This would change, of course, but I'm not sure how, the story idea is to just transplant modern geopolitics, but it doesn't seem likely that anything will stay that way.