Considering the views of Niall Ferguson (in “The unconscious colossus: limits of (& alternatives to) American empire”), Anthony Pagden (“Empire, liberalism & the quest for perpetual peace”), and Robin Blackburn (“Emancipation & empire, from Cromwell to Karl Rove”), explain how they all don’t generally agree that the United States is an empire?

Considering the views of Niall Ferguson (in “The unconscious colossus: limits of (& alternatives to) American empire”), Anthony Pagden (“Empire, liberalism & the quest for perpetual peace”), and Robin Blackburn (“Emancipation & empire, from Cromwell to Karl Rove”), explain how they all don’t generally agree that the United States is an empire?