Had the Biafran Army at the beginning of the war a chance to conquer Lagos and ursurp the Nigerian goverment? The scources seems not clear about it.
Otherwise, WI not Gowon, a Christian, was president of Nigeria, but a Muslim from the North. World opinion give mostly a damm about suffering Christians, but what if the Civil war had much more the flavor of an genocid at Christians through Muslims. Or the muslim president leanes much more to Nassar and Washington starts to see him as a soviet client.
Would it made a differnt if there is a conservativ goverment in Britain?