The WorldBloodBank states that US Blacks at a rate of 49 percent have O blood, 27 percent have A blood variants and 20 percent have B variants. and 7 percent have AB variants.
I have B positive as stated above in previous posts.
Here's a list of the commonality in Asians with B variants throughout the globe.
Kalmuks of (western China)-41 percent
Gypsies of (Hungary)-35 percent
Burmese(southeast Asia)-33 percent
Buryats (Siberia) (Siberia)-33 percent
Chuvash(a republic of Russia)-33 percent
Thais(Thailand)-33 percent
Chinese(Peking)-32 percent
(Ainu) of Japan-32 percent

A little odd since I'm mixed ethnic black and have B positive blood, which is one of the 2nd lowest blood types of American Born african americans.
And all the variants of B blood are in asian/eurasian providences and or countries.

I guess I now see why I drew crayon photos of the hills and farmlands of ancient Japan as a child...hmm. genetics must be strong...
I should probably not put too much weight into this, but please explain in your own way, I'm non biased and would like to hear from anyone who takes the time to read this, then they surely can comment.