The biafrian war was crazyIt actually made a huge difference for them. Basically till 10 years ago. 90% of govt revenue in Nigeria was from oil. So from the 60s always till like the 2010s everything built or done by the govt in Nigeria was through oil money. It's impossible to imagine how much worse everything in Nigeria would be without oil money. They even fought a war in the 60s and killed a bunch of igbo to prevent them from leaving Nigeria since that was where the oil was produced.