The end of Christendom
The European Miracle, the Age of Enlightenment and the formation of the great colonial empires together with the beginning decline of the Ottoman Empire mark the end of the geopolitical "history of Christendom". Instead, the focus of Western history shifts to the development of the nation-state, accompanied by increasing atheism and secularism, culminating with the French Revolution and the Napoleonic Wars at the turn of the 19th century.
Writing in 1997, Canadian theology professor Douglas John Hall argued that Christendom had either fallen already or was in its death throes; although its end was gradual and not as clear to pin down as its 4th-century establishment, the "transition to the post-Constantinian, or post-Christendom, situation (...) has already been in process for a century or two," beginning with the 18th-century rationalist Enlightenment and the French Revolution (the first attempt to topple the Christian establishment). American Catholic bishop Thomas John Curry stated (2001) that the end of Christendom came about because modern governments refused to "uphold the teachings, customs, ethos, and practice of Christianity." He argued the First Amendment to the United States Constitution (1791) and the Second Vatican Council's Declaration on Religious Freedom (1965) are two of the most important documents setting the stage for its end. According to British historian Diarmaid MacCulloch (2010), Christendom was 'killed' by the First World War (1914–18), which led to the fall of the three main Christian empires (Russian, German and Austrian) of Europe, as well as the Ottoman Empire, rupturing the Eastern Christian communities that had existed on its territory. The Christian empires were replaced by secular, even anti-clerical republics seeking to definitively keep the churches out of politics. The only surviving monarchy with an established church, Britain, was severely damaged by the war, lost most of Ireland due to Catholic–Protestant infighting, and was starting to lose grip on its colonies.
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