I believe it's drawing comparison between the ongoing territorial struggles in the Middle East (and perhaps elsewhere?) with the European 'settlement' of North America - 'Manifest Destiny' indeed!
Basically from the point of view of, say, an aggressive Arab sheik with an eye for 'Lebensraum', it's saying to the US 'if, 500 years ago, you could invade an already-settled area, commit mass genocide, pretty much annihilate the indigenous population - and then spend the next half-millenium trying to justify your actions to the rest of the world
I believe it's drawing comparison between the ongoing territorial struggles in the Middle East (and perhaps elsewhere?) with the European 'settlement' of North America - 'Manifest Destiny' indeed!
Basically from the point of view of, say, an aggressive Arab sheik with an eye for 'Lebensraum', it's saying to the US 'if, 500 years ago, you could invade an already-settled area, commit mass genocide, pretty much annihilate the indigenous population - and then spend the next half-millenium trying to justify your actions to the rest of the world
Why can't we?'