Can anybody help me with this? Why does Edward Gibbon have this opinion? What does it mean?

What are the similarities and differences between byzantine empire and kiev russia

Which of the following is an example of the pull factor known as economic migration? a. better educational opportunities pulling people towards a new country b. mexican laborers entering the us to work in agricultural jobs c. joining family members that are already in a new country d. crop failures driving people away from their country i am unsure on this question, i was thinking b? but i could be wrong.

Why must governments be able to compromise?