No, you're completely wrong. That may have been how they got to North America, but that is not why they are so agressive. There have been attempts to pacify the bees by further cross breeding with the European variety, but they failed. I seriously doubt you have ever been to Africa, as every time I have approached a hive in Malawi they have begun bussing me at about fifty paces. I grew up on a farm next to a Dutch neighbor who had an apiary with Eurpean bees, and you could sit right next to a hive without being bothered. In the bush you would be dead if you got that close.
I'm not an entomologist or anything, but this is my direct experience. The Bantus go out for honey all the time, and they do not use smoke or anything to chill the bees out. They do not harvest it in any thoughtful way. They tear the hive apart, and rip the comb out. The bees go crazy. Do this for a few centuries or a milenia and you get what you deserve.
Post a link smarty pants. I've seen this with my own eyes. The breeding has nothing to do with the agressive nature of African bees, and everything to do with them trying to survive.