Forced pregnancy is the practice of forcing a woman or girl to become pregnant, often as part of a forced marriage, including by means of bride kidnapping, through rape (including marital rape, war rape and genocidal rape) or as part of a program of breeding slaves (see Slave breeding in the United States). In the 20th century, state mandated forced marriage with the aim of increasing the population was practiced by some authoritarian governments, notably during the Khmer Rouge regime in Cambodia, which systematically forced people into marriages ordering them to have children, in order to increase the population and continue the revolution. Forced pregnancy is strongly connected to the custom of bride price.