Maybe it is a strong word, but it applies... Relations in America between immigrant diasporans and African-Americans aren't roses. We can't get along here. Don't think for a moment that the members of these ethnic groups in these African countries wouldn't get upset if African-Americans came over en masse, started setting up shop and had success. I personally feel that we're the same, however, a lot of people, Africans and non-American blacks don't share the same sentiment.
What happened with Liberia doesn't make it any easier. Africans use that an example as to why African-Americans shouldn't be trusted... I'll admit.. African-Americans that repatriated made mistakes, but the US government was the reason why that situation didn't work. The circumstances are different now and I doubt the problems that came from that situation can be avoided.
Regardless, African-Americans aren't favored that highly. Our numbers in the motherland are minute. That is the reason why it's quiet... for now.
Relations in America with any immigrant group isn't roses. And I have to disagree about both sides getting along. As an African, I, my family members, and my friends who are African have got along very well with Black-Americans. In fact, out of all the "native" American groups, Black-Americans are the ones I'm the most comfortable being around. And remember: immigrant diasporans are but a representation of their nation, not THE representation of their nations or even the continent at large. It's a very, very big place with over a billion ppl.
As for Black-Americans moving to Africa en masse and setting up shop: well, lets be realistic, most black-Americans will NOT move to Africa. Many would say that finances are a factor, but the fact is most just don't want to. If anything, black-Americans will be trickling in throughout a very extended period of time.
Meanwhile, non-africans have are already setting up shop: the Chinese, the Lebanese, the Indians, the Europeans, and now American multinationals are already putting their foothold. So the notion that off top Africans would be upset that a group of black people would arrive to "set up shop" is a bit of a stretch imo.
My recommendation to any black-americans willing to more to Africa: do your research on each region of the continent (and their countries), find a few countries that you feel is a good fit for you, TRAVEL to those places first to get an idea of the culture, the people, the economic situation, political situation, and most importantly, see if you would be able to and be willing to integrate into the country.
That was the main issue with Liberia: rather than getting the natives of the land involved in creating the country, the black-Americans who arrived brought the same white supremacist segregationist mentalist they've lived through and implemented it into the founding of Liberia. A native Liberian, for example, hasn't gotten to power until a civil war in the 70s-80s, which continued issues till very recently.
Also, black-americans don't have to gather in only one country: why not be in a region of the continent? Or the major cities throughout the continent? One country most likely won't be a fit to everyone.
In the end, I believe that it would be beneficial to both parties. Black-Americans will be in a part of the world were they no longer have to worry about racial prejudice and systematic racial discrimination. Plus your money will go much, much farther, and if willing, black-americans can be critical in building up infrastructure those countries need, such as a strong(er) medical system, a stable financial and banking system, and so on. African countries get very needed human capital that is educated and experienced, and they indirectly gets very needed foreign investment into their countries. And, imo, because black-americans have lived in a part of the world were rule of law (relatively speaking) has value, they can play a role into emphasizing its value, something certain countries need work on.
It won't be easy: there will be some push back, culture shock, and adjustments needed on both parties. But I much rather have members of the black diaspora (black-americans, carribeans, afro-latinos) be in the continent making moves, instead of other foreign groups.