Charles Downer Hazen 
The Rise of Empires: European History, 1870-1919 [EPUB ebook] 
Fifty Years of Europe from the Franco-Prussian War Until the Paris Peace Conference

’The fifty years that have elapsed since the Franco-Prussian War possess a unity that is quite exceptional among the so-called 'periods’ of history. They constitute a period of German ascendancy in Europe, a ascendancy acquired by force, maintained by force, an dedicated to the perpetuation and the extension of the rule of force — that is, to the great principle that might makes right. Within that era are included the rise and the fall of the German Empire, whose history was summarized in a lapidary phrase pronounced by President Poincaré at the opening of the Conference of Paris 'It was born in injustice; it has ended in opprobrium.’