At the beginning of the twentieth century England's empire spanned the globe, its economy was strong, and its political system seemed immune to the ills that inflicted so many other countries. After a resounding electoral triumph in 1906, the Liberals formed the government of the most powerful nation on earth, yet within a few years the House of Lords lost its absolute veto over legislation, the Home Rule crisis brought Ireland to the brink of civil war and led to an army mutiny, the campaign for woman's suffrage created widespread civil disorder and discredited the legal and penal systems,...