What would happen to America if blacks disappeared?

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[I got this from an American. Jan]

What would happen to America if blacks disappeared?

1] US population would decrease by 12%
2] US employment rate would decrease by 1.5%
3] US prisoners reduced by 48%
4] US gangs and other criminal groups reduced by 5390
5] US average IQ would increase by 7.5%
6] US average SAT scores would rise from 1000 to 1100 points [ 2016 ]
7] US number of patients with chlamydia would decrease by 59%
8] US number of patients with gonorrhea would decrease by 69%
9] US number of patients with syphilis would decrease by 57%
10] US average income would increase by $20k
11] US number of people living in poverty would decrease by 54%
12] US number of homeless would decrease by 65%
13] US number of welfare recipients would decrease by 52%
14] US democratic voters would decrease by 26%