Thus, when under threat, they are willing to sacrifice themselves and their ideals for the survival of the group from which they draw their self-este… - Isabel Wilkerson

Newcomers learn to vie for the good favor of the dominant caste and to distance themselves from the bottom-dwellers, as if everyone were in the grip of an invisible playwright. They learn to conform to the dictates of the ruling caste if they are to prosper in their new land, a shortcut being to contrast themselves with the degraded lowest caste, to use them as the historic foil against which to rise in a harsh, every-man-for-himself economy.

I discovered, while working on The Warmth of Other Suns, that I was not writing about geography and relocation, but about the American caste system, an artificial hierarchy in which most everything that you could and could not do was based upon what you looked like and that manifested itself north and south. I had been writing about a stigmatized people, six million of them, who were seeking freedom from the caste system in the South, only to discover that the hierarchy followed them wherever they went, much in the way that the shadow of caste, I would soon discover, follows Indians in their own global diaspora.

They did not ask to be accepted but declared themselves the Americans that perhaps few others recognized but that they had always been deep within their hearts. NOTES ON METHODOLOGY I began this work because of what I saw as incomplete perceptions, outside of scholarly circles, of what the Great Migration was and how and why it happened, particularly through the eyes of those who experienced it. Because it was so unwieldy and lasted for so long, the movement did not appear to rise to the level of public consciousness that, by any measure, it seemed to deserve. The first question, in my view, had to do with its time frame: what was it, and when precisely did it occur? The Great Migration is often described as a jobs-driven, World War I movement, despite decades of demographic evidence and real-world indicators that it not only continued well into the 1960s but gathered steam with each decade, not ending until the social, political, and economic reasons for the Migration began truly to be addressed in the South in the dragged-out, belated response to the Civil Rights Act of 1964. The second question had to do with where it occurred. The migration from Mississippi to Chicago has been the subject of the most research through the years and has dominated discussion of the phenomenon, in part because of the sheer size of the black influx there and because of the great scholarly interest taken in it by a cadre of social scientists working in Chicago at the start of the Migration. However, from my years as a national correspondent at The New York Times and my early