Which events brought unity and which brought disruption in the middle ages?

In the Middle Ages, events that brought unity included the establishment of the Holy Roman Empire and the spread of Christianity, which unified diverse populations under a common religion and political authority. Conversely, the Crusades and the conflicts arising from feudalism created significant disruption, leading to warfare, social fragmentation, and economic instability. Additionally, the Black Death caused widespread loss of life and societal upheaval, further fracturing communities and diminishing the Church's influence.