What is the theme of the study of world history since world war 1?

poltical and economic isolation

For the answer to the question above,  Martin Luther is using a metaphor to describe the struggle of segregation for himself and others. He accused the church leaders of not taking action, as they didn't experience the pain he is experiencing. He is trying to tell the church leaders that they have not experienced his hardships and struggles , so why are they making decisions to the things they didn't even experienced or understand?