What differences do the black migrants notice as they travel from north to south?

The correct answer is the following.

The great difference that black migrants noticed as they traveled from South to North was that not everything that was told about the North was true, although it had better conditions than the South.

With the Great Migration of African Americans in 1916 that began to leave the South to look for better opportunities in the North, many people was willing to work in the industrial fabrics at cheap wages. White people did like the idea because they thought that African Americans displaced from those kinds of jobs.  

During migration, African American people were looking for better working conditions, better education opportunities, and moving away from segregation and race problems.