Daniel 7:17 "These great beasts, which are four, are four kings, which shall arise out of the earth."
Daniel 7:5 "And behold another beast, a second, like to a bear, and it raised up itself on one side"

The next kingdom after Babylon was Medo-Persia.
Talking to the king of Babylon.

Thy kingdom is divided, and given to the Medes and Persians. (Daniel 5:28)

It was raised up on one side because Persia rose to be the greater power.

Daniel 7:5 "and it had three ribs in the mouth of it between the teeth of it: and they said thus unto it, Arise, devour much flesh."

Three ribs because Medo-Persia conquered Babylon, Egypt and Lydia.

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1843 Chart (By Charles Fitch and Apollos Hale)		1850 Chart (By Otis Nichols)