I don’t think that matters much for the distances we talk about. Any such disruption — even if it’s a new philosophy or religion that makes the colonies stop sp

I don’t think that matters much for the distances we talk about. Any such disruption — even if it’s a new philosophy or religion that makes the colonies stop spreading — would only travel at the speed of light, which means that it would take a long time to reach the frontier of a civilization that expands at nearly light speed.