People leaving Africa right now are being forced out by war and violence, most of them aren't choosing to leave.As respectfully as possible, this is completely wrong.
https://www.google.com/search?q=migrant+crisis+economic
I phrased this a little wrong, the source of the current refugee crisis is mostly not Africa, but my point is that the societal disruption you're referring to is not caused by voluntary immigration.
Not even the majority of unauthorized border crossers into Europe are from Syria. Once again with all due respect, these are very definitely voluntary actions on the part of the border crossers.
Check out this article from 2 years ago, even then it wasn't primarily Syrians.
https://www.theatlantic.com/magazine/archive/2015/07/closing...
The migrants come from a vast swath of Africa and the Middle East, spanning not only war-torn Syria (in the first four months of 2015, Syrians accounted for just 30 percent of those crossing the sea) but also Nigeria and the Gambia and Eritrea and Somalia and Mali.
The migrants who embark upon this journey are typically represented as terrorized and impoverished—as people driven (to quote Amnesty International) “to risk their lives in treacherous sea crossings in a desperate attempt to reach safety in Europe.” The demographic and economic facts complicate that story. When populations flee war or famine, they generally flee together: the elderly and the infants, women as well as men. The current migrants, however, are overwhelmingly working-age males. All of them have paid a substantial price to make the trip: it can cost upwards of $2,000 to board a smuggler’s boat, to say nothing of hundreds or even thousands of dollars to travel from home to the embarkation point in the first place. Very few of the migrants from Libya are actually Libyan nationals.