Which of these events influenced the formulation of the truman doctrine?

truman's background as a farmer

the dropping of the bombs on hiroshima and nagasaki

truman's time as a judge in missouri

the soviet's plan for expansion

Soviet´s plan for expansion

Explanation: this plane became quite visible in USSR´s behaviour in Eastern and Central Europe immediately after the end of the WW II.

du boi was considered a radical because he wanted the immediate end for segregation. the biggest different between him and booker t. washington is that, even though washington believed that segregation should be considered illegal, he did not believe at all that a law was needed to keep blacks away from whites and that this would be something natural (to have the races apart) for a long time until society adjusted, while du boi believe that agitation was the only way to end segregation.