@biggamer132:
Thanks, you are completely right, and I had overloooked completely those facts. Those achievements qualify completely for the Industrious trait.
It's just that when I thought of Persia, I rather thought of the Medic Wars, but under this new light, I rather think that they indeed would be better off as
Industrious and Commercial. Industrious for they now obvious and big public works, Commercial for their efficient manage of a big for the time empire. Millitaristic and Scientific would be the following traits that could apply, then.
I agree that Zoroastrianism has had a big influence in the history of religion... but more in a cultural way than in a truely mystique and religious way. And it was not quite a drive for them... at least comparred to other civs of their age.
About expansionistic, as you can see, I'm not adjusting it under the light of "domination" but of "exploration", so you will understand why I'm not awarding it to them

.