Thou, O king, art a king of kings: for the God of heaven hath given thee a kingdom, power, and strength, and glory.
Thou ... art a king of kings. The committal of power in fullset plenitude belongs to Nebuchadnezzar personally, as having made Babylon the mighty empire it was. In 23 years after him the empire was ended: with him its greatness is identified, his successors having done nothing notable (Daniel 4:30, "Is not this great Babylon, that I have Built for the house of my kingdom by the might of my power, and for the honour of my majesty?" Not that he actually ruled every part of the globe, but that God granted him illimitable dominion in whatever direction his ambition led him, Egypt, Nineveh, Arabia, Syria, Tyre, and its Phoenician colonies (Jeremiah 27:5-8). Compare as to Cyrus, Ezra 1:2, "The Lord God of heaven hath given me all the kingdoms of the earth."