What two civilizations had such a great influence on later cultures that they were called the "mother cultures"

Historians have recently discovered a historical journal published in the early twentieth century. the journal contains facts based on original sources about the downfall of the early byzantium empire. historians consider this long-lost journal to be a breakthrough in their understanding of the byzantium empire. based on this information, the journal is a source.

The national security act of 1947 reflected:

Otto von bismarck once said that a great war might someday be caused by some damed foolish thing in the balkans was he right, explain