Quigley's fascinating history of the 19th and 20th centuries with an eye to the development of the Anglo-American establishment that Quigley explored in his posthomously published book of the same title.
Really classic Quigley stuff here, he uses this method of "evolution of civilization" derived from his lecture series of that title, which was later utilized by Samuel Huntington in the Clash of Civilizations to explore the development of western civilization towards global hegemony.
Today Quigley's legacy is unfortunately associated largely with NWO conspiracies, with the academic element having split off into "global governance" studies.
Anyone familiar with Quigley knows what to expect here: to survive in the 20th century the British Empire recast itself as the long term "commonwealth" under the leadership of the Milner/Rhodes race imperialists who sought to ultimately get American back into the Empire. Like Niall Ferguson, Quigley is really useful for providing a broad-brush overview of major developments that might otherwise get swallowed by narrative specifics.
Basically though, if you've read the Evolution of Civilization and the Anglo-American establishment, you're getting the same stuff here.