Which war prompted significant African American migration to northern job centers due to demand for labor?

The war that significantly prompted African American migration to northern job centers due to labor demand was World War I. During this period, a multitude of jobs became available in the North as factories shifted to war production, creating a substantial need for labor. Many African Americans, seeking better economic opportunities than those available in the South, were drawn to northern cities, which led to what is known as the Great Migration.

While World War II also saw increased migration due to labor demands, the context of the question specifies the war that initially sparked this trend. The migration during World War I laid the groundwork for subsequent movements during later conflicts including World War II, but the question specifically targets the initial impetus for significant migration. Thus, the correct answer highlights the impact that World War I had on reshaping African American demographics and labor dynamics in the United States.