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Bigamy is the act or condition of a person marrying another person while still being lawfully married to another spouse. It is illegal in the United States. The crime is punishable by a fine, imprisonment, or both, according to the law of the individual state and the circumstances of the offense
Many US courts (e.g. Turner v. S., 212 Miss. 590, 55 So.2d 228) treat bigamy as a strict liability crime: in some jurisdictions a person can be convicted of a felony even if reasonably certain there was only one legal spouse. For example, if a person has the mistaken belief that their previous spouse is dead or that their divorce is final, they can still be convicted of bigamy if they marry a new person
In Canada all provinces adhere to the federal Criminal Code of Canada, which makes polygamy an offense and punishable by up to five years in prison.