When war against the Horde Prime brought peace to Etheria, it was quite a big change as throughout many years the Rebellions fighting against Horde is very much a custom due to Lord Hordak managing to conquer at least 4 territories including Thaymor and ruling for many years and of course former horde cadet , Catra taking over the reigns and managing to conquer and destroy Salineas the sea kingdom also counts.
Although She-Ra the princess of power brought peace and harmony to Etheria, she is not without help, she had the heiress of Bright Moon and archer expert with her, including the biggest support She-Ra ever received not from any royalty nor any natives of Etheria, it's in fact a warrior from another world or one should say, from another planet. There isn't one warrior, rather two warriors from another planet, and their names are Ben Tennyson, wielder of the gadget, the Omnitrix and Rook Blonk, a Plumber officer as they all managed to defeat the evil that is Horde Prime.
The new peace and harmony also brought the planet back to their original galaxy that Etheria once had stars after heiress of Bright Moon, Queen Glimmer drove the planet out of Despondos, Etheria's dimensional prison leading a million years of isolation.
However She-Ra and her alliance didn't defeat Horde Prime alone as Ben Tennyson and Rook Blonko also brought along help from their home planet, which is Earth, consisting an anodite, an osmosian and the whole Intergalactic Enforcers known as Plumbers like Rook Blonko lead by Magistrate Max Tennyson.
With the Horde army disbanded and Horde Prime defeated a lot of changes happen with Plumbers and Ben Tennyson lending help to rebuild whatever damages the Horde and Horde Prime did. For example, rebuilding Salineas, Magister Patelliday helped Queen Or Princess Mermista and her significant one, Sea Hawk with the structures of the former sea city as well as the system included.
The peace also brought more people together like former She-Ra and her magicat lover, Catra, Queen Glimmer and her archer, Bow, scorpi royalty Scorpia and Princess Perfuma, Mermista and her rekindled lover, Sea Hawk including the new loves like Entrapta and former lord Hordak and even Kyle, Rogelio and Lonnie all got together and the throuple even adopted Hordak's former spy, Imp as their kid.
Unfortunately, not all good things stay as the Hordak clones are rapidly scattered throughout Etheria, the former Bright Moon Rebellion's allies, the Star Sisters turns out to be greedy, power-hungry, dark magic using harpies who are Former Queen Angella's ancient enemies, much to Glimmer's dismay and Mermista's on-&-off relationship with Sea Hawk causing a rift and a lot of hatred towards Catra which is very reasonable.
On the brightside, some problems were solved with the Hordak clones rounded up and put to good use on Earth instead of Etheria while the Star Sisters were then defeated and arrested by the Plumbers to ensure no harm towards Queen Glimmer of Bright Moon and her soon-to-be husband, Bow and including her father, the former Bright Moon king, Micah. However some problems still remain like Mermista's on-&-off relationship with Sea Hawk and then new problem arose…