What were the advantages to migration as noted in the nonfiction book, The Warmth of Other Suns?

Although black migrants from the South encountered many obstacles in their new homes in the urban centers in the North and West they were, as a whole, resilient, determined and as successful as it was possible for them to be. Their positive outlook for their chances of achieving their goals was a phenomenon that sociologists referred to as “migrant advantage.” It is a spark that lies within any immigrant who is compelled to leave one place for another, better place. These people prove to be extremely goal-oriented which keeps them from becoming disillusioned or discouraged in their quest for a happy new existence. Immigrants from the same regions often form groups to encourage each other and to keep up the spirits of one another.