Reasons for divorce vary, from sexual incompatibility or lack of independence for one or both spouses to a personality clash.
The only countries that do not allow divorce are the Philippines and the Vatican City, an ecclesiastical state, which has no procedure for divorce.
Countries that have relatively recently legalized divorce are Italy (1970), Portugal (1975), Brazil (1977), Spain (1981), Argentina (1987), Where it is seen as a contract, the refusal or inability of one spouse to perform the obligations stipulated in the contract may constitute a ground for divorce for the other spouse.
In contrast, in some countries (such as Sweden, divorce is purely no fault.
Many jurisdictions offer both the option of a no fault divorce as well as an at fault divorce.