World War One’s revolutions anchored Black radical thought to the twentieth century.

Evidence

Finally, of course, there was the overpowering spectacle of European radicalism and revolution apparently launched by the First World War. No matter their ideological or theoretical legacy, liberal or otherwise, it seemed to some that these events were bound to the immediate forces that overtook the older capitalist order in the twentieth century. Moreover, the names of twentieth-century revolutionists—Zapata, Lenin, Trotsky, Gandhi, Mao, Fidel, Lumumba, Ho Chi Minh, Cabral (and many others)—represented at the same time, more than Marx and Engels had anticipated in the nineteenth century, and much less. In any case, it was eminently obvious to them that Black revolutionary thought found its beginnings here. — Cedric J. Robinson, Black Marxism_ The Making of the Black…, 843