There were many factors of this.
1. The Vikings attack
2.The Magyars attack
3.The Muslims attack
4.The Black Death kills many people
5.Corruption in the government
The Crusades brought much riches to Western Europe and created a sense of religious unity.
decline in religious unity and in the power of the Catholic Church
Eastern Europe does not seek anything from Western Europe other than political unity and aid.
Unity and stability.
decline in religious unity and in the power of the Catholic Church
The civilisation of the Germanic peoples.
The civilisation of the Germanic peoples.
The Catholic Church and the Latin language helped united western Europe after the Roman Empire collapsed.
The Military
Unity Bank ended in 1978.
No, but it is about unity.
Venezuelan Popular Unity ended in 2007.