After the fall of the Roman Empire in the 5th century CE, it was Christianity that brought a sense of unity to the different peoples of Europe in their path to conversion. Christianity cemented a sense of culture, tradition, and belief particularly European that revolved around the figure of the Christ and its representative on earth, the Pope as he gained more and more political power in Europe and as the Church began to concentrate knowledge and its production in monasteries and what later, at the end of the middle ages, would become universities.
The europian shared the same religious beliefs, their rationalist philosophy, its improvement of science and technology, its intentions for revolution and social justice and its firsthand adventures helped to promote the so-called "Cultural Unity in Europe" after the collapse of the Western Roman Empire.
The supreme court extends its powers by their decisions which sets a precedents knows as case law. This law is followed when lower courts make decisions. It decides if the laws congress is making are constitutional or if they can be overturned.
