After the Northern Alliance unleashed nuclear weapons on Ares and bombarded various colonies with their fleet, a period of stagnation and survival ensued.
It lasted around 400 years, starting in the early 1400s PC.
Many of the other countries spent much of this time rebuilding and consolidating their power. Life for the average civilian ranged from unchanged to bare subsistence.
The Isylorian Order used this as an opportunity to bring billions into their fold. Cementing themselves as a dominant power in humans space.
Evidence of the war and the strife that followed is all but erased by time. A few cities were abandoned, traces of radiation still linger, and near-forgotten monuments to the dead are weathered and overgrown.
The colonies that were obliterated, have had their transit rings dismantled, and the Artikybahl Devices recovered. Unless you knew where to go with a transit capable ship, you would never know these planets existed in the modern age.