Migration processes vary within different types of species. For example, Canadian geese rely on their insinct to migrate at a certain time, like all other species, but Canadian geese have concentrations of iron in their noses that react to the earth's magnetic feild, in a way giving them their own built in compases. Because geese are so sensitive to forces, the iron "points" them in the right direction (just like in humans as we have enough iron in our bodies to make a 2 inch nail, but our iron levels are dispersed throughout us, and we are not nearly as sensitive, so this does not work on us, so don't try to magnatize yourself).
more territory
Many African Americans want jobs & education
Called "drought" - if it lasts long enough them migration or death.
The wildebeest migration in the Masai Mara typically occurs between July and October, with the peak of the migration occurring in August and September. However, the timing of the migration can vary slightly from year to year depending on factors such as rainfall and grass growth.
Since the Huns attacked the Germanic tribes the Huns caused the largest migration in history. The migration just didn't happen in Western Roman Empire but it affected the whole nation!
If the Great Migration didn't happen, African Americans would likely have remained more concentrated in the Southern United States. This could have resulted in slower progress towards civil rights and economic opportunities that many African Americans found in the North and West during the Great Migration. Additionally, cultural exchange and diversity in northern cities would have been impacted.
internal migration takes place with in the country,it happens because of limited resources or inadiquated supply of something.that cause people to move from one area to a nother.
http://www2.ops.org/NORTH/curriculum/socstudies/EthnicB2/past/Irish.htm
migrationImports and Exports
If the Great Migration didn't happen, African Americans would have likely remained primarily in the southern United States. They would have continued to face racial segregation, limited economic opportunities, and the oppressive Jim Crow laws. The cultural and demographic changes that occurred as a result of the Great Migration, such as the growth of African American communities in northern cities, would not have taken place.
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Counter migration- migration in the opposite direction. Counter Migration - forced migration of immigrants to return to their country of origion