what event seemed to cause the Great Migration to slow?

Several events contributed to the slowing of the Great Migration, including:

1. The implementation of the Immigration Act of 1924, which restricted immigration from certain countries and established quotas, leading to a decrease in the number of immigrants coming to the United States.
2. The Great Depression of the 1930s, which resulted in widespread unemployment and economic hardship, making it less desirable for African Americans to move to the North in search of better opportunities.
3. The outbreak of World War II in 1941, which led to a reduction in available jobs and resources in Northern cities, causing African Americans to reconsider moving to the North.
4. The emergence of the Civil Rights Movement in the 1950s and 1960s, which brought attention to the systemic racism and discrimination faced by African Americans in both the North and South, prompting some to stay and fight for equality in their home communities.