The three factors caused the Great Migration are
1. Economic Factors
2. Demographic factors
3. Socio-culture factors
Step-by-step explanation:
People migrate easily to the need for jobs. Unemployment, low salary jobs, an unsatisfactory life leads the people for migration.
Some migration based on the increase of population, which makes less availability of resources. Some socio-culture factors are conflicts with their family or surroundings that will lead the people for migration.
Some political factors also lead to the migration of the people. Few others migrate for Higher Education from rural areas to urban areas.