There have been at least two other instances in American history in which specific groups of human beings were stripped of their rights of person-hood as a means of justifying horrific mistreatment. African-Americans and Native-Americans both felt the brunt of a system which tried to create the artificial classification: human, non-person.
This distinction wasn't based on an honest evaluation of the evidence. It was made with an eye towards justifying a specific action. In the case of Native-Americans, they had land. In the case of African-Americans, they had labor.
Classifying them as non-persons (even property) provided a moral framework for those in power to forcefully take what they wanted without compensation. Today, "unwanted," unborn children don't hold anything as tangible as land or labor, but their claims on those who would eliminate them are no less significant.
They stand in the way of an unencumbered, more self-absorbed lifestyle. Once again, this notion that human beings can be classified as "non-persons" is not built on an objective assessment of the facts. It is built on the utilitarian attempt to justify abortion. I have always believe that GOD sent you, now I know why he sent you into my life, I understanding the reason, and I thank GOD for your life...