During World War I, more than 300,000 African Americans moved to northern cities. The war, which had disrupted the lives of many southerners, led to a shortage of labor in the North, which in turn attracted African American workers. The Great Migration had a significant impact on both the South and the North. In the South, it led to a decline in the agricultural workforce and a rise in urbanization. In the North, it led to an increase in the black population and the growth of black communities. The Great Migration also played a role in the civil rights movement, as it brought together African Americans from different parts of the country and exposed them to new ideas and experiences.