France is a country and countries don't marry so France can be neither monogamy or polygamy.
monogamy
Monogamy means the practice of having only one wife
My aunt is monogamy.
Monogamy - album - was created in 2000.
The Myth of Monogamy was created in 2001.
serial monogamy
Synonym: Bigamy Antonym: Monogamy :D
monogamy
The Game of Monogamy was created on 2010-10-05.
monogamously
monogamy