The silent Republic (Alien takeover)

History
in 2022 region of Portugal and most of northern Africa mysteriously disappeared and no one remembered anyone was ever from that region or anyone who ever that there people the generations during the nuclear war,  the colonization of the stars and the terraforming no one knew this area even existed but was real. It was later revealed in 2500 of this entire region had been occupied by mysterious alien group known as the silence that made everyone forget the existence of this entire region of. It is clear that the doctors command for humans to kill the silence   during the moon landing finally resulted in the killing of all the rest of this group. Still very little is known about this region on what exactly the silenced into it. The memories of everyone are still fuzzy and most people like to forget about this part of the world. The silences presence did something to the region that makes people sick or feel uncomfortable when they are there. there is also weird time dilation and strange phenomenon. As a result the entire region known as the silent Republic was isolating quarantined and no one has permission to go on the region. The only person who may have helped the doctor died in 2023 and as a result no one on earth to do this region.