Not all revolutions were so glorious, however. The French Revolution shows us the dangers of radical change that is imposed top-down. Lasting change comes bottom-up, like the Industrial Revolution in Britain and the United States, which fueled the rise of the world’s modern superpowers and gave birth to the political divides we know today. Even as Britain and America boomed, technology unsettled society and caused backlash from machine-smashing Luddites and others who felt threatened by this new world. In the second half of the book, Zakaria details the revolutions that have convulsed our times: globalization in overdrive, digital transformation, the rise of identity politics, and the return of great power politics with a vengeful Russia and an ascendant China. Vladimir Putin and Xi Jingping see a world upended by liberalism – and want to turn back the clock on democracy, women’s rights, and open societies. Even more dangerous than aggression abroad is democratic decay at home. This populist and cultural backlash that has infected the West threatens the very foundations of the world that the Enlightenment built – and that we all take too easily for granted. The book warns us that liberalism’s great strength has been freeing people from arbitrary constraints―but its great weakness has been leaving individuals isolated, to figure out for themselves what makes for a good life. This void – the hole in the heart – can all too easily be filled by tribalism, populism, and identity politics. Today’s revolutions in technology and culture can even leave people so adrift that they turn against modernity itself.