Winner
Diverse in Unity
surprising to see that the Salarians haven't really expanded much beyond their own local cluster.
They have. You need to keep in mind that the clusters show on the map are only those that are relevant to Shepard. There are probably hundreds more which are simply omitted. Salarians do have numerous colonies according to some of the background info for ME. They have the 2nd largest economy in Citadel space, IIRC, so there's probably a lot more of them then there are humans.
Serpent Nebula = Citadel?![]()
Yes. Also, Local Cluster = Arcturus Stream in ME3.
I am not really surprised about the Salarians. They don't seem like they care to expand that much. There could be other factors, such as their comparelatively short life spans or some of their advanced technology and differing view or reproduction and sexuality (as I recall, reproduction i only done out of necessity not because of pleasure or other forces) that relieve population pressures that would encourage expansion. Nor do they seem to fit well in establishing mining and other economic colonies, leaving that to the other races and acquiring it with service and advanced technology.
The one that somewhat surprises me is that the highly agressive and militaristic Turians did not expand a lot, though it is possible that there are more relays in that section of the galaxy that have not been visited. Same for the Salarians, there is noting saying that this is all the active relays in the galaxy, just all that can be visited in the three Mass Effect games.
Again, only clusters/worlds shown in ME games are on the map. They've never released a detailed map that would show all relays and accessible clusters. The in-game Codex says that the Asari have by far the biggest economy, followed by Salarians and Turians (who, not being particularly profit-minded, rely on the Volus in economic matters). Humans are behind all the old council races, despite their aggressive territorial and economic expansion since they've joined the galactic community. It stands to reason that others must have numerous other colonies besides those shown in the game.
The map might create an impression that Humans are the most powerful race because they control the greatest number of clusters, but that's only because the first game in particular takes place mostly in human-controlled space so we know the most about it. Also, human colonies are small compared to those of old council races - just a few million inhabitants, compared to hundreds of millions or billions on Asari and Turian colony worlds.