"Increasingly, therefore, the formal international structure came to diverge from the real one. International politics became global politics, in which at least two non-European powers were to intervene effectively, though this was not evident until the twentieth century. Furthermore, it became a sort of oligopoly of capitalist-industrial powers, jointly exercising a monopoly over the world, but competing among themselves; though this did not become evident until the era of ‘imperialism’ after the end of our period."