In all honesty, I'm open to changing my views if you give me well sourced information that's not aryan nation.org. The common arguments I'd put forth against your issues with modern african societies are:

Third world country?: colonialism destabilised established political order, looted natural resources (process still going on today). The primary cause for instability in africa and indeed in the arab world is that these societies never evolved democracy or even a "nation-state" ala the west. Instead loyalties were delineated by family, clan and tribal allegiances. a loose coalition of tribes would then form a "nation". When you try and force a democratic system of government on a social structure like this, you're going to have a bad time because everyone votes for their tribal leaders and eventually one guy figures out it's best to just get some machetes and kill everyone. cue bloodbath. It's the fundamental reason democracy efforts failed in arabian countries and afghanistan and the primary factor behind the instability, violence and murder you see in africa today.

Written script: Are you srs bro, there's over a thousand languages in that continent and most of them have a written script. They're usually pretty obscure and most were replaced by "lingua-franca" type scripts, so arabic in the north, ethiopian in the horn etc. But I can guarantee that written scripts have a long history in africa. While I'm prepared to concede that they may not have reached the prominence as in the west, it's because most african cultures rely (like most tribal cultures) heavily on oral history and story telling. It's highly likely writing was only used for official purposes. I can point you to arabic as an example. The only reason we have a standardised arabic alphabet was because generation after generation of ruling class were taught how to write. Even today, there is a heavy emphasis on oral teaching in arabic cultures (I know because I'm a dirty sand-nigger as you'd probably say).

slaves: The reason you have so many africans in slavery is because the northern part of africa, so berber groups, turks and to some degree egyptians were the ones who started the slave trade. You think that whitey rocked up to africa and took slaves himself? nah m8, he was sold the captured sub-saharan africans by a fat slave trader sitting in the emirates/sultanates along the modern day libyan and tunisian coast. It makes sense that you have a lot of africans as taking slaves was a normal part of warfare in africa.

Technology: why have they not invented boats or farming? They're sub-saharan africans bro, they live in the biggest desert in the world and they couldnt farm worth shit even if they tried. Why the fuck you need boats in the desert? If you cast your eyes further north, you will find that the seaside dwelling cousins of these people had indeed developed boats. In fact, they were so good at the whole naval thing that they became termed "barbary corsairs" and kicked crusader ass up and down the Mediterranean.

I'm not an american so I have no clue about segregation. From what I can see your african american culture is absolutely fucking fucked through the head. It values thuggery and anti-authoritarian behaviour over personal growth and the like. As a corrolarry, the housing projects you have set up seem to be plagued with all manner of social ills. (this may not necessarily be whiteboy's fault, but institutionalised racism HAS to play a role in denying the first generation of "equal" africans their "equal" opportunities in the workplace and so one. Not saying it's a deciding factor, but it is there). Aside from that I have no clue about the states. Feel free to correct me if you can.

I'm curious to hear what you have to think

I saw your response below and I'll edit and add some more points. Yeah they exploited precious metals. They actually have built monuments though, I outlined why their current government sucks, science and philosophy. You'd be surprised. Astronomy is the one that I know of, but I'd argue that at points they were probably more advanced that european societies simply because of the abundance of natural resources. In all honesty, I highly highly doubt you would be a multi-millionaire if you moved because you'd get fucked in the ass by all the things I outlined above.

Yea african's are fucked. But I argue that they are a product of their environment more than their environment a product of their nature.