There are legal reasons when a marriage can be declared invalid via an annulment. These reasons include:
- Incest: When the people married are close blood relatives
- Bigamy: When one spouse is already married to someone else
- Age: If either party filing for an annulment was under the age of 18
- Unsound mind: If either party could not understand the nature of the marriage and obligations that come with a marriage
- Fraud: If either party was coerced into the marriage through fraud, like the inability to have children or to get a green card
- Force: Either party consented to the marriage as a result of force
- Physical incapacity: If either party was physically incapable of consummating the marriage
