I'd go back to West Africa in 1470, and take a duffel bag full of guns and ammo and the technology will be the schematics to mass produce more guns/ammo/bombs etc.etc. by using the resources readily available on the continent. Then i'd unite the peoples under one banner and train/build with them for the next 10-15 years or however long exactly it takes for the Europeans to arrive. Then this time shyt's going to be different.
shyt now i want to write a novel about this