aliens are one race(which includes humanity).
all aliens are from earth in the EXTREME distant past.
they're all denziens on their home planets.
move to germany, after a 1000yrs pass, you'd consider yourself german.
Germans aren't from Germany, they're from the caucaus mountains in georgia. Etc
one giant super civilization
why you find millions of city sized abandoned preserved cities underground that date to billions of years ago.
find them all over the moon, mars, venus, mercury, astroid belt, moons of gas giants and in solar systems next to us and out to near infinity.
even Pleiadians aren't from the Pleiades star cluster
they say they're from Vega(star in lyra constellation)
Andromedans, Sirians, Orions(positive ones), say the same thing.
They even say they're not even from Lyra, but rather they are from somewhere even further out but it's lost in time to them.
Little different for higher dimensional beings. Cuz they can materialize a body from a higher dimension and say hey I'm from such and such place. Pleidians, Sirians, Andromedans say they're a mix of different dimensional beings. 3rd to 8th or so.
Here's the trick, even the higher dimensional aliens are also denziens in their home dimension. They progressed to the 4d, 5d and 6d versions of their planets from somewhere even further out in those dimensions.
Considering the earth has a form in 4d, 5d, and 6d then it starts to make more sense.