A more thorough explanation:

The Unities Doctrine of Marriage, also known as the Legal-unities Doctrine, was a common-law rule that stated that a wife had no separate existence from her husband. This meant that a married woman's legal identity was merged with her husband's, and she had no legal rights or property of her own.

For example, if a woman owned property before marriage, it would become her husband's property after they were married. Similarly, any income earned by the wife belonged to the husband, and he had the right to control her actions and decisions.

This doctrine was eventually challenged by the Married Women's Property Acts, which granted married women the right to own property and control their own income. The Spousal-Unity Doctrine, which held that a husband and wife were one legal entity, was also abolished.

Overall, the Unities Doctrine of Marriage was a discriminatory practice that denied women their legal rights and autonomy. Its abolition was a significant step towards gender equality and the recognition of women's individual rights.