If you actually had a bit of sense what's going on in Europe instead of blindly listening to whatever right wing party puts those ideas out in the country you are living, it should be clear to you that how Greece was handled and the German and French banks bailed out using peoples money has much more to do with the state of Europe right now than immigration. It's such an old, tired trope to divert blame like this, but apparently there are still enough people ignorante enough to not see through the simplest of diversion tactics.
Blacks are like 1/6 of the world and throught the whole history of humanity they accomplished almost nothing noteworthy.
And the history of Africa. A gigantic, resource rich continent with a great climate getting conquered and outplayed by a speck of land called Europe. Even now they don't have any strategic vision and just sell out their resources and land for nothing to Europeans/Asians. It is the same amognst MOST of the US/Europeans blacks, short-sighted and emotional decisions, or a lack of thereof