The Beginning of the Creation:
The IPA's formation happened during the Rubek crisis. As many of the outer rim and border colonies were unsatisfied of how they were being treated. Nothing really happened then except that many of the colonists grew uneasy towards the Gigerdi Alliance and some even felt they were no longer a part of it. Rubek was then soon removed from power and the colonists thought that things would become much better now, but nothing changed and unrest rose even more. The final blow happened during the Lightness War.
The Creation:
During the Lightness War all the protecting ships that had been assigned to the outer rim colonies and border colonies were dispatched elsewhere leaveing the systems totally undefended. Some of the protecting ships refused to leave and some returned later against orders. Nothing was done to those ships as there was no resources available. Same time the same thing occurred within the borders of the United Federation of Planets. The UFP and GA colonies then engaged in discussions in forming their own alliance against the Lightness and in the future against their former owners. Both sides agreed and the first version of the Interplanetary Alliance was formed. The alliance survived through the war, but the problems only began after it.
The Conflict:
The UFP acknowledged the independence of the IPA. The GA, however, thought otherwise. As Mad Gigerdi Jr. became the president of the newly formed IPA the hostilities arose. The GA demanded the IPA to return all military equipment, but the IPA refused and the conflict begun. First ones and Folans sided with the IPA and Bacterians and the Hemmoians sided with the GA. The conflict lasted only a few months until a peace treaty was signed. This meant that the President Mad Gigerdi Jr. had to resign his commission.
The Emissary Threat And New Frontiers:
The IPA constructs two new state-of-the-art cruisers with first one weaponry. The IPA then learns that a previously unknown species, the Emissaries, are planning to attack both Gigerdi Prime and Aldaain. The Emissaries have already persuaded the DHR to make a diversionary attack on Aldaain, and so the Emissaries helped by the Daglians attack Aldaain. Aldaain's surface is badly damaged, but the Hfed forces manage to destroy the attackers. Some sort of the plague was released to Aldaain and then spread throughout the Hemmoian collective. Another invasion fleet is heading for the Gigerdi Prime and all nearby GA forces are quickly scrambled to defend G-prime. UFP also mobilizes its fleets and sends them to GP. After a terrific battle, they emerge victorious. It all comes with a price, The Emissaries destroying a full Continent from G-prime and releasing a deadly virus to the galaxy. IPA sends the I.P.A.S. Valiant along with the G.A.S. Exploreison and the I.P.A.S. Exploration to search for the cure in the Andromeda and nearby galaxies. Five years they have time to find it, but will they find it in time to save the galaxy and the first ones? Only time will tell...