Soon after the U.S. entry into World War II, the automotive industry was converted to military production; high wages were offered, attracting large numbers of workers and their families from outside of Michigan. The new workers found little available housing, and competition among ethnic groups was fierce for both jobs and housing. With Executive Order 8802, President Franklin D. Roosevelt on June 25, 1941, had prohibited racial discrimination in the national defense industry. Roosevelt called upon all groups to support the war effort. The Executive Order was applied irregularly, and blacks were often excluded from numerous industrial jobs, especially more skilled and supervisory positions.