This is one of the best books that I have read on global power. One of Kennedy's reoccurring themes is that a continuing strong economy is necessary to maintain a nation's standing. He values urbanization, industrialization, and per capita income. I particularly found his contrast and comparison on Russia and The United States in the 19th Century as emerging powers. His data on the results of Britian's "cutting edge" industrial revolution technology, and it's productive results, is unbelievable. I constantly go back to this book. It is not only a treasury of insight into past balance of power equations but also those of today.