What is the fine-grained topic of the following text: For now the noise of hooves thun­der­ing across the veldt, the clam­our of the hus­tings in a score of con­tests, the shots in Sid­ney Street, the angry guns of Gal­lipoli and Flan­ders, Coro­nel and the Falk­land Islands, the urgent warn­ings or the Nazi threat, the whine of the sirens, the dawn bom­bard­ment of the Nor­mandy beach­es, the sto­ry of the Jews and Israel, the hor­ror of the Holo­caust, the tales of Auschwitz and the Allies, of The Right­eous few who saved some, of the Sovi­et refuseniks—their sto­ries are over, their record writ­ten. Only return the topic.
Historical events and conflicts from the 20th century.