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The main effect on World War 1 was that it destroyed buildings and encouraged United States to become a world power.
What is the term Great Migration about?
The Great Migration was also known as Great Northward Migration that occurred between 1916 and 1970.
The South had fewer schools, lower literacy levels, and poorer basic services than the North in the early 20th century is True.
The effects of WWI that contributed to the Great Migration include option B: Increase in Europeans immigrants to the the US.
Some of the hardships and challenges for African Americans living in the South include option A, B and D: Racial violence,Disenfranchisement and Jim Crow laws.
Learn more about European immigrants, refer to the link:
https://brainly.com/question/1082315