I doubt it. I had fibroids at the ripe old age of 29, even though I've never been pregnant. I've had a lot of stress in my life, but I doubt it was as bad as girls who got pregnant in high school, and went on to become welfare mothers. Besides, the average age for women to get fibroids is 35. My roommate in the hospital was a 36-year-old white woman who had 2 kids.
I understand while fibroids are more prominent in black women, white women are more prone to endometriosis (which I personally find worse). I had a white male roommate whose 19 year old daughter had endometriosis. Childbirth is supposed to solve that problem; she married and immediately got pregnant, giving birth to twins. On the other hand, I had a middle-aged co-worker, a white woman, who'd had 3 kids, and the endometriosis kept returning. She finally solved the problem by getting a hysterectomy.
"And what do Asian women get?" asked a Chinese co-worker, with whom I discussed the issue. "Nothing! They just screw up the curve on math scores!" I answered jokingly. Then she informed me they're more prone to cancer. Her mother had been deceived by her doctor into losing a baby by getting treatment for cancer.
There are no perfect races; everyone is prone to something.