Good article, but I think the author makes the decline of most European empires more complicated than they really were. I believe simple geography -- and its relationship to international trade and military affairs -- played a far more important role in this decline than most people realize. The Romans were the dominant civilization for hundreds of years because their ability to extend their influence and project force throughout the Mediterranean Sea was unparalleled. They were less successful in projecting force to the east over land, since technology (i.e., maritime vessels and the associated military/trade applications of such) was far less important in land-based movement than in water-based movement.
Spain, France, the Netherlands, and Great Britain became the dominant colonial forces that grew out of the remnants of the Roman Empire because their exposure to the Atlantic Ocean made them better-suited for expansion over long distances across wide bodies of water. And Great Britain eventually dominated the North American colonial scene because as an island nation in the harsh waters of the northern Atlantic Ocean and North Sea their superiority on the high seas -- in terms of raw seamanship and maritime skills -- was unparalleled.
AC,
thanks for your thoughts. I enjoyed reading them.
ampu