The document summarizes some of the major events in 14th-15th century Europe that led to the creation of modern states. It describes periods of crisis including climate change, the Black Death pandemic which killed over half of Europe's population, and popular uprisings by peasants against wealthy landowners. Two significant wars are mentioned: the Hundred Years' War between England and France from 1337-1453, and the War of the Roses from 1455-1485 which was a civil war in England between the houses of Lancaster and York. These conflicts weakened central authority, caused widespread death and economic problems, and ultimately led to the establishment of stronger centralized nation states.