Why does Eric Hobsbawm describe the period between 1780 and 1848 as a period of dual revolution? Among his arguments on the Age of Revolution, the Age of Capital, the Age of Empire, and the Age of Extremes, which one do you prefer? Why?

Four books by Eric Hobsbawm:

1)    The Age of Revolution: Europe 1789-1848
2)    The Age of Capital: 1848-1875
3)    The Age of Empire: 1875-1914
4)    The Age of Extremes: The Short Twentieth Century, 1914-1991