America is made up of people who came from someplace else. Even the Native Americans came over the Bering strait... America is what it is because people came from someplace else.
People leave when life becomes untenable where they are.
Many immigrants do not talk about what they endured back home. They were fleeing that world, and when they left they didn't want to talk about it because there had been pain and heartbreak under the caste system of the South. They didn't want to burden their children with what they had endured.
What I love about the stories of the Great Migration is that this is not ancient history; this is living history. Most people of color can find someone in their own family who had experienced a migration of some kind, knowing the sense of dislocation, longing and fortitude.
I mean my mother migrated from Georgia -Rome, Georgia, to Washington, D.C., where she then met my father, who was a Tuskegee Airman who was from Southern Virginia. They migrated to Washington and I wouldn't even exist if it were not for that migration. And I brought her back to Georgia, both my parents, actually.
It was illegal for black people and white people to play checkers together in Birmingham. And there were even black and white Bibles to swear to tell the truth on in many parts of the South.