What is the fine-grained topic of the following text: For example, there is a broad consensus that the fall of the Berlin Wall (1989) and the subsequent collapse of the Soviet Union marked the end of an era, an era ushered in by the assassination of Archduke Ferdinand in Sarajevo in 1914 (Eric Hobsbawm’s ‘short twentieth century’). Only return the topic.
End of the 'short twentieth century' marked by the fall of the Berlin Wall and the collapse of the Soviet Union.