NAACP membership peaks at 450,000 during wartime

By 1945 NAACP membership had grown from 50,000 in 1940 to approximately 450,000 — a ninefold increase driven by wartime mobilization, the Double V campaign, and high-profile cases including the Port Chicago mutiny defense. The organization's expanded membership and financial base gave it the institutional strength to prosecute the legal strategy that would culminate in Brown v. Board of Education.