Theory of armed rebellion was dropped because it depended on European proletarian revolution

Evidence

The work of the Bureau continued all through the war and in 1945 there came a sharp break with the theory… . The Bureau changed its position from the achievement of independence by armed rebellion to the achievement of independence by non-violent mass action. But to say that is one thing, to carry it out in practice is another… . To stake independence upon armed rebellion was therefore to have as a precondition the collapse or military paralysis of the metropolitan government. It was in other words to place the initiative for African struggle upon the European proletariat… . — Cedric J. Robinson, Black Marxism_ The Making of the Black…, 1278