Vietnamese vs. Serbians vs. Black Americans

Vietnam
~$6,900 GDP per capita (Purchasing Power Parity), according to the IMF
http://www.imf.org/external/pubs/ft/weo/2017/01/weodata/weorept.aspx?pr.x=73&pr.y=7&sy=2017&ey=2022&scsm=1&ssd=1&sort=country&ds=.&br=1&c=582&s=NGDPD%2CNGDPDPC%2CPPPGDP%2CPPPPC%2CLP&grp=0&a=
Murder rate: 3.3/100,000 (2012 WHO Estimate)
https://www.unodc.org/documents/gsh/pdfs/2014_GLOBAL_HOMICIDE_BOOK_web.pdf (page 128)
Murder rate 1.425/100,000 (average from 2008-2011, UN Office on Drugs and Crime's International Homicide Statistics database): http://data.worldbank.org/indicator/VC.IHR.PSRC.P5?locations=VN&name_desc=true

Serbia
~$15,000 GDP per capita (PPP), according to the IMF
http://www.imf.org/external/pubs/ft/weo/2017/01/weodata/weorept.aspx?pr.x=31&pr.y=9&sy=2013&ey=2017&scsm=1&ssd=1&sort=country&ds=.&br=1&c=942&s=NGDPD%2CNGDPDPC%2CPPPGDP%2CPPPPC%2CLP&grp=0&a=
Murder rate of 1.2/100,000 (Eurostat/CTS)
https://www.unodc.org/gsh/en/index.html (page 131)

Black Americans
~$23,000 GDP per capita (PPP), according to an article presented by The Atlantic (a mainstream left-leaning outlet), citing IMF/US Census figures
https://www.theatlantic.com/international/archive/2014/10/what-if-black-america-were-a-country/380953/
Black Americans had a murder rate of 34.5/100,000 from 1980 to 2008
https://www.bjs.gov/content/pub/pdf/htus8008.pdf
Black Americans 31 times more likely to be arrested for murder than a White American in NYC in 2014
https://2kpcwh2r7phz1nq4jj237m22-wpengine.netdna-ssl.com/wp-content/uploads/2016/03/Color-Of-Crime-2016.pdf
Black Americans generally do actually commit a disproportionate amount of crime: https://pastebin.com/AWEwBCFF

Vietnam and Serbia both have a higher average IQ (94, 90 respectively) than average 85 IQ black Americans
https://www.ttu.ee/public/m/mart-murdvee/EconPsy/2/Lynn_Meisenberg_2010_National_IQs_calculated_and_validated_for_108_nations.pdf (National average IQ)