While all four verses are obviously talking about the same thing, verse 21 is where God named Grecia, or Greece, as the next world power to take control.  However, after its leader, Alexander the Great, would die, something odd would soon happen to this empire.  What happened to this empire?

-It disappeared from history-

-It split into the Northern and Southern Kingdoms-

-It split into the Eastern and Western Empires-

-Oh no, it divided into four empires-