Some causes of nations joining world war 1
- Assassination of Archduke Franz Ferdinand
- Military rivalry between powerful nations
- US: the Zimmermann Telegram and the sinking of the Lusitania
- Colonies: The wish that if they fought for for their European countries they could be free, and so they join the war, making it a World War effectively
hope this helps
I think it would be Constantine the Great, which is one of the most famous Christian emperors of Rome. He was very active when it comes to spread Christianity in Rome.
Richelieu's two goals were 1) To make the king all powerful in France and 2) To make France supreme in Europe. Cardinal Richelieu, Chief Minister of King Louis XIII of France from 1624 to 1642, aimed, on the one hand, at establishing an absolute monarchy in France, vesting the king with unlimited centralized authority and total sovereignty while limiting the power of the nobility, and, on the other hand, at turning France into the greatest and most powerful nation in Europe while also playing a key role in the development of the French Empire.