Well, i've done a couple notes on Jalilu history pre-contact so far.
General idea with how contact went being that the Hegemony peacefully went through diplomatic processes that would lead to the integration of sol. One of the results would be the UN being propped up as the unifying entity to make earth into a world-state that while allowing relative law answers to absolute law, which seemed at first like a good idea to the ruling party at the time. It would be a several decades however, before the integration was official, consolidating a world with 100+ nation states never war going to be easy. Humans by the year 2070 would be a hegemony species. Between that time and now will remain to be seen.
Jalilu history I've got outlined. I avoided specifics for the time being; I want to make sure people have players to expand lore which is also why I went vague on how each major country on earth reacted towards the UN being diplomatically propped up as a world government by the Hegemony.
The Upsilion Andromadae star system is technically younger than sol, but not by that much. Complex life developed quicker in the transition from lower level bacteria to multicellular bacteria than on earth.
Jalilu's modern evolutionary form comes from 195 thousand years ago.
13000-15000 years ago the first known Jalilu civilizations appeared.
The first written records of Jalilu history appear little over 7000 years ago.
A Jalilu civilization industrialized about 1000 years ago and would in the following centuries multiple civilizations would colonize the binary star system, spaceship technology being developed more rapidly than on earth due to more worlds within reach thanks to coming from a jovian moon system. In fact, their star system consists mostly of jovian moon systems. Lots of bitterness existed between Jalilu nations at the time.
Around 600 years ago however, their civilizations nearly hit the breaking point as binary star systems lack much in asteroid mining outside of jovian planet rings. Lots of violence in these times, to say the least.
550 years ago, the Jalilu are claimed to have gambled their whole species on a interstellar project that involving the use of a worm hole gate set up by a unmanned probe that moved at near relativistic speeds.
530 years ago, the project- on perhaps a coin flip in history, was successful allowing for colonization of a neighboring star system, one humans unceremoniously named "HIP 7918", the name Vatilu Nex being the name given to it by the Jalilu. The opening of the worm hole was monumental, further projects would be initiated with faster engines.
The Hegemony is five hundred years of age, and it formed at nearly the same time Jalilu colonization of HIP 7918 was underway. The Hegemony at first was actually a rather confederate entity that was founded on the following basic tenets:
There is absolute law and relative law. Absolute law is universal, while relative law is imposed by local authorities.
A stable order = progress. A unified civilization without instability means prosperity.
Linking of the stars. Star systems being integrated into the hegemony's network of worm holes being of great importance.
A governing entity without corruption with leaders by merit; The Hegemony would develop into a multi-party meritocracy.
In the following hundred years, the hegemony's colonization efforts at first were rather slow due to the costs of setting up a worm hole link to another star system even with the power the Hegemony of the Stars had. By 400 years ago the Hegemony would make up the lost populations from bygone times and it would seem, that the ancient grudges, on the highest levels of society at least, have been put aside.
360 years ago came a invention that revolutionized the rate at which the hegemony would connect the stars. Fast As Light Travel would be invented, making interstellar travel more rapid of a prospect. In the following century, various star systems of interest would be connected to the Hegemony. In the travels of legendary Jalili explorers, intentionally blindly leaping to alien star systems, alien worlds of countless sorts were discovered in the first century alone. The Jalilu discovered alien life for the first time in this century, Vatilu Nex having a world much like their home world, but not any native alien life.
Contact with an industrialized alien civilization would occur for the first time 300 years ago when the first worm hole was set up in the Solar System. By this time, the Hegemony had colonized dozens of star systems. The human question would end up leading to the development of the following tenets of the hegemony:
The Integration of Sapient Beings to a Universal Civilization.
This entails the following:
A Universal Language.
A Universal Economy.
A Universal Governance that transcends species.
A prospect that, was arguably a success with humans at least. Humans by current day being a major species of the Hegemony having colonies in many worlds and star systems by present day. However, the hegemony in due time would be exposed to aliens much different from them than humans are...
Since the integration of humanity, 300 years to now the hegemony would spread across many more stars and integrated multiple species into the hegemony. However in those three hundred years the universal tenets have been undermined, local officials overstepping authority, constant need to put down rebellions and attempts to secede from the hegemony and even the occasional threat of a full-on civil and so, so much more has put the current state of the hegemony in deterioration.
One might note how I am intentionally vague about a lot of things. This is mainly since I am worried I might limit options too much for other players. However, I did include the universal tenets in this blurb on history that also might have went a bit into the cultural mindset of the hegemony.
Edit:
Fuck fuck fuck fuck fuck fuck fuck fuck^7 I made massive astronomy mistake.
Upsilion Andromadae's star system is fucking whack. Any alternatives within 25-35 ly of earth?