All these happened after 1421 China plotted the world map and Europe stole the map start destroy the world.
North America was stolen by Europeans in 1498, 70 years later. "China and Africa becomes a poor countries suppressed by Europeans cannot rise for next 500 years when Europeans were building N America.
China was attacked with opium trade war and Africa for natural resources and human trafficking for slave trades.
Europeans don't need millions of slaves in Europe bcos it is not a big continent, but N America lands can take many slaves for sugar plantation economy, wheat economy, coco economy for Europeans market. Steal humans in Africa continent for slavery work is free and easy disposed them. Can raped them for free sex too...
To the Europeans, Africa must remain poor forever and cannot rise. But China is going to rise them up, take arms and become wealthy. One day 报仇雪恨 the past go after the European blood .... it is happening now....