Holding the Frontier

well ive had an AWESOME campaign so far, so once again, much thanks to the EB team, amazing job!
im in greece now, but theres just one thing i wanna know: is it worth building an Allied State in major cities of different cultures? i made one in athens and the greek archers, horsemen and hoplites were a great addition to my forces, just wondering if EVERY culture is as good (i already know that Carthagian lands are useless, since you get crap skirmishers and worse cavalry) cheers all!

So, what other purpose should have made that thing?

https://forums.totalwar.org/vb/showthread.php?t=93896


EDIT: And no, you do not an allied government to get Greek archers.