They all speak english though, so I have to assume that they were originally from either the U.S. or U.K.
Wasn’t there some EU story that explained the origins of humans in the SW universe? Like they were astronauts from Earth or something caught in a wormhole that threw them through space and time until they were stuck in the sw Galaxy. Then of course reproduced and spread.
I vividly remember seeing something like that. Maybe it was like bad fan fiction or something.
You’re thinking of Alien Exodus.
http://starwars.wikia.com/wiki/Alien_Exodus
Long story short, it was never published and none of its elements were ever canonized within the old EU.