What is a Sphere of Influence?

Brainliestttme : describe the following event: increase in islamic extremism in the middle east

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.

Which of the following contributed to the grown and success of the roman empire