Du Bois’s experiences during World War I led to disillusionment, and by the 1950s, he had become a radical peace activist, opposing US militarism and aligning with global peace movements, particularly during the Cold War.

Du Bois’s support for World War I remained unchanged throughout his life, as he continued to advocate for American military involvement.

Du Bois’s political beliefs were not influenced by his experiences in either World War I or the McCarthy era, and his activism was primarily focused on economic issues.

Du Bois’s radical peace activism in the 1950s was a direct result of his experiences in the McCarthy era, unrelated to his earlier views on war and peace.