The dominant race of Eberron, humans are originally from the continent of Sarlona but migrated westward nearly 4,000 years ago arriving in the region now known as The Lhazaar Principalities. Over the next century humans spread across the face of Khorvaire establishing settlements that would later evolve into what are now known as the Five Nations.
Since humans are a relatively young race in Eberron there are no distinct racial subtypes. Natives of the five nations tend toward certain personality stereotypes, but few could pick out a Brelander from a Karnnathi just on sight alone. Some lingering tensions exist between citizens of nations following the Last War, but these hostilities lie only in the nation in which one pledges allegiance to. A Cyran refugee who embraces the Silver Flame and thranish culture would be just as accepted by other citizens of Thrane as a native born.
Humans possess four of the thirteen dragonmarks. Because of this they have established themselves as one of the most powerful races in Khorvaire. Humans also seem to be exceptionally adept and skilled at learning all manner of trades from blacksmith to anthropologist to fate-tempting adventurers humans demonstrate a proficiency in anything they set themselves to. While they don’t meet the high standards of dwarven or elven craftsmanship, or the fortitude of the half-orcs or even the multifarious talents of the gnomes they more than make up for their lack of individual strength with a versatility that is second to none.