The United States allows a person to end a marriage by filing for a divorce on the grounds of either fault or no fault. In the past, most states only granted divorces on fault grounds, but today all states have adopted a form of no fault divorce. Fault and no-fault divorces each require that specific grounds be met. A no fault divorce can be granted on grounds such as irretrievable breakdown of the marriage, irreconcilable differences, incompatibility, or after a period of separation, depending on the state. Neither party is held responsible for the failure of the marriage. On the other hand, in fault divorces one party is asking for a divorce because they claim the other party did something wrong that justifies ending the marriage. Several grounds for fault divorce include adultery, cruelty, abandonment, mental illness, and criminal conviction.