Hello! I've recently gotten very invested in this story I came up with a few week ago and I'm trying to expand on the world it's set in. So here is a summery of what I have so far. In 2026 the first alien contact was made when a distress beacon outside of Mars was discovered. The origin of the distress signal was a small ship with a painting depicting some sort of insect like head on it. Upon entering the ship it seemed abandoned until a single seemingly harmless 1 meter tall gray humanoid alien was discovered. When the crew tried to communicate with it they were killed within seconds as it tore them apart. It was a parasite commonly known as a "chameleon parasite", it changes it host genetically and turns them extremely hostile. (This part may seem random but I felt like I should add this since it's kind of the start of everything.) From that point onwards more and more intelligent alien species made contact with earth, and it wasn't long before more than 30 species of alien life forms found themselves on Earth. Most of them didn't come individually but instead in one large network that came looking for species intelligent enough to be included in their search. A large council consisting out of many leaders who were powerful at the time was created with the purpose of deciding if they should join this alien association or not. They started seeing everything as a bigger picture and see Earth as one united nation. This is how the GAC (Guardian angel council) was created, they were the supreme power that ruled over the entire Earth. The GAC generally did a good job ruling and were liked, until they were faced with the problem of over population. There were still a large number of aliens left on Earth, which as the GAC had decided weren't as important as the ones who originated from Earth. In 2037 a large invisible force shield was built around the Earth, it's being upheld by thousands of mechanical joints. It keeps anything from entering and exiting. When the shield was done they sent out thousands of soldiers to eradicate any aliens they could find, all of the soldiers were dressed in white armor and thus the term "white reaper" was born. This is when the ECC was born, also known as the Electric Cobra clan. It mostly consisted out of aliens set on rebelling against the GAC in the beginning, but it didn't take long until large amount of humans joined. With more and more joining the ECC they were really starting to make a difference. After three years of fighting the GAC was brought down from power when their main base of operations was stormed and the council was executed. Even though this was seen as a victory 80% of all the aliens on Earth were dead and it was still on permanent lock down. The only survivor with any sort of influence was the daughter of Edward Von Hale (A council member), Tiara Rosalina Von Hale. The last of the GAC forces and scientists escaped underground under Tiaras command. On the surface the ECC keep growing and now rule over Asia, Europe and Africa. South america was basically abandoned after the GAC bombed it due to the amount of aliens that lived there. Oceania is pirate territory that is mostly avoided, and North americaI'm still figuring out. As you see it's kinda vague what exactly I'm doing with the world after this (Flawed, I know) backstory. So, If this is where my question comes in, what can I do with places like north America? Where do I start developing cultures and such? I'm new to this I just don't know where to start, how to start and where to stop. I don't even know if what I already have is acceptable or not. But do remember that the text here is more of a summary and I skipped the all the details like dates and species. Anyway, I hope someone can help me with this. Thanks in advance.