Neo-Babylonian Empire
The prophecy was not fulfilled in Micah's time, but a hundred years later when Judah was facing a similar crisis with the Neo-Babylonian Empire, Micah's prophecies were reworked and expanded to reflect the new situation. Still later, after Jerusalem did fall to the Neo-Babylonian Empire, the book was revised and expanded further to reflect the circumstances of the late exilic and post-exilic community.