Slavery only changed form!!! The US would not conquer the world the hard way because americans had the example of Hitler, failing to conquer the world the hard way. They did it in a very sutil way, by exploiting nations around the world economically and SLAVING nations, by making war in other countries fighting territory with the USSR in the end the US won by emerging as the most powerful nation, ECONOMICALLY SPEAKING, in the 80s this is how the US takes care of their own people by sucking economies around the world, just like Romans did.The us of amrica should be changed to the us of ROME. You NORTH-AMERICANS need to learn to accept the truth about your country and to be more compassionate for other people around the world. vietnam, korea, iraq south and central america are just a few nations where the us gobernment fought wars killing innocent people!!!! YOU ARE THE ONE WHO NEEDS A LESSON IN HISTORY!!!! Dropping atomic bombs did not work because otherwise you guys would not have slaves to exploit, so it is out of the question!!!