The exception Marx made is no longer correct in our current age, capitalism has changed since 1872. It is for that reason that Lenin already noted in 1917 that this was no longer the case:
“It is interesting to note, in particular, two points in the above-quoted argument of Marx. First, he restricts his conclusion to the Continent. This was understandable in 1871, when Britain was still the model of a purely capitalist country, but without a militarist clique and, to a considerable degree, without a bureaucracy. Marx therefore excluded Britain, where a revolution, even a people's revolution, then seemed possible, and indeed was possible, without the precondition of destroying "ready-made state machinery".
Today, in 1917, at the time of the first great imperialist war, this restriction made by Marx is no longer valid. Both Britain and America, the biggest and the last representatives — in the whole world — of Anglo-Saxon “liberty”, in the sense that they had no militarist cliques and bureaucracy, have completely sunk into the all-European filthy, bloody morass of bureaucratic-military institutions which subordinate everything to themselves, and suppress everything. Today, in Britain and America, too, "the precondition for every real people's revolution" is the smashing, the destruction of the "ready-made state machinery" (made and brought up to the “European”, general imperialist, perfection in those countries in the years 1914-17).”(V.I. Lenin, State and Revolution)
"There are decades when nothing happens; and there are weeks when decades happen." - Lenin
