Guardian Unlimited | Columnists | Jonathan Freedland: Rome, AD ... Rome, DC?

Guardian Unlimited | Columnists | Jonathan Freedland: Rome, AD ... Rome, DC? But that difference between ancient Rome and modern Washington may be less significant than it looks. After all, America has done plenty of conquering and colonising: it's just that we don't see it that way. For some historians, the founding of America and its 19th-century push westward were no less an exercise in empire-building than Rome's drive to take charge of the Mediterranean. While Julius Caesar took on the Gauls - bragging that he had slaughtered a million of them - the American pioneers battled the Cherokee, the Iroquois and the Sioux. "From the time the first settlers arrived in Virginia from England and started moving westward, this was an imperial nation, a conquering nation," according to Paul Kennedy, author of The Rise and Fall of the Great Powers.

More to the point, the US has military bases, or base rights, in some 40 countries across the world - giving it the same global muscle it would enjoy if it ruled those countries directly. (When the US took on the Taliban last autumn, it was able to move warships from naval bases in Britain, Japan, Germany, southern Spain and Italy: the fleets were already there.) According to Chalmers Johnson, author of Blowback: The Costs and Consequences of American Empire, these US military bases, numbering into the hundreds around the world, are today's version of the imperial colonies of old. Washington may refer to them as "forward deployment", says Johnson, but colonies are what they are. On this definition, there is almost no place outside America's reach. Pentagon figures show that there is a US military presence, large or small, in 132 of the 190 member states of the United Nations.