The "whole" Earth in those days was flat.
Go figure.
Nimrod was a utopian, the first of many: Nebuchadnezzar (another Babylonian and the first of Daniel seven’s beast to rise from the sea), Darius the Persian, Alexander the great, Julius Caesar, Constantine, Charlemagne, Napoleon, Mussolini, Hitler, Lenin, Stalin, the antichrist and his ten UN NWO groups of nations.
The way to bring peace and utopia was to end fighting between nations by conquering all of them. One has to be king OF kings to do this. Blessed utopias all of them.
Jesus will bring the true utopia at his 2nd coming. He is the prince of peace, and true king of kings.