/sci/ - Science & Math

I grew up in a liberal family and never had a silver racism in me. I never questioned black IQ or why Africa is a shithole, my excuses were always environmental (Africa got colonized, Blacks have been held back because of racism) but now that I've spent a lot of time on /sci/ I've become slightly racist. I mean I don't hate or dislike people cause they're black or Hispanic, I mean I have black and Hispanic friends but now I seriously question if the reason blacks are in the situations they are in(crime, very undeveloped countries) is because they are genetically dumber then other races. What is the consensus of why black Iq is like 75 in Africa? Is it genetic or are certain races victims of things like colonization etc? If they are dumber then average, how long will take for them to get to average and is it even possible? If I ever bring this topic up to my immediate family they will instantly assume I'm some hateful racist when really I just want the truth and the ability for an open discussion.

The biggest thing that worries me is that since we have so many immigrants from central/south America immigrating to the USA with no filter for the quality of people we let in (all the 85 IQ folks are the main source) that in 50 years when Hispanic people become a majority that this will dumb down America and the USA become more like the less useful countries in South America. This serious question can be applied to mass immigration from the Middle East to Europe. Is this a serious threat?