I believe that the idea of a Roman Empire enduring in Europe 300 years after its fall is explained because the Roman Empire symbolized the idea of power and unity of a huge Empire. For political reasons, many emperors such as Charlemagne wanted to maintain this title so he could inspire an idea of Emperor and Empire that took almost all European countries.
Romans suffered a major setback when the Celts—or Gauls, as the Romans called them—invaded the Italian peninsula from the north, destroyed a Roman army, and sacked the city of Rome. After the Celts withdrew, the Romans were able to rebuild their city and recoup their losses.
Aaron Burr.
Its why hamilton wrote the federalist papers
If you’re talking about world war 1, Russia entered into World War I on August 1, 1914, when Germany declared war on it. In accordance with its war plan, Germany ignored Russia and moved first against France—declaring war on August 3 and sending its main armies through Belgium to attack Paris from the north.
Hope that helped!!