For a sample of 59 countries, the correlation between sex ratio (WHO data) and the abortion rate (Guttmacher data) is -.26. In other words, countries with more men tend to have a lower abortion rate. The feminist interpretation of this would be that men are anti-abortion (i.e., they like to control women). The problem with this is that, at least in the United States, surveys indicate that men support abortion in numbers similar to women; they are just don't care about the issue as much.
Women usually turn to abortion when having a baby is inconvenient, and not having a stable relationship with a man is a major factor. It is not surprising, then, that societies that have a shortage of men (or suitable men) have high rates of abortion. The case of blacks in America is consistent with this view. Because of factors like male imprisonment, unemployment, and a lack of desire to commit, black women face a situation where there are always men ready for sex, but few who are available, willing, and suitable for a long-term relationship. The result is lots of abortions.