Plaçage was a recognized extralegal system in French and Spanish slave colonies of North America (including the Caribbean) by which ethnic European men entered into the equivalent of common-law marriages with non Europeans, of African, Native American and mixed-race descent. The term comes from the French placer meaning "to place with". The women were not legally recognized as wives but were known as placées; their relationships were recognized among the free people of color as mariages de la main gauche or left-handed marriages. They became institutionalized with contracts or negotiations that settled property on the woman and her children, and in some cases gave them freedom if enslaved. The system flourished throughout the French and Spanish colonial periods, reaching its zenith during the latter, between 1769 and 1803.
It was most practiced in New Orleans, where planter society had created enough wealth to support the system. It also took place in the Latin-influenced cities of Natchez and Biloxi, Mississippi; Mobile, Alabama; St. Augustine and Pensacola, Florida; as well as Saint-Domingue (now the Republic of Haiti). Plaçage became associated with New Orleans as part of its cosmopolitan society.
The plaçage system developed from the predominance of men among early colonial populations, who took women as consorts from Native Americans and enslaved Africans. Later there developed a class of free people of color in Louisiana, and especially New Orleans, during the colonial years, from whom wealthy men would choose. In this period there was a shortage of European women, as the colonies were dominated in the early day by male explorers and colonists. Given the harsh conditions in Louisiana, persuading women to follow the men was not easy. France recruited willing farm- and city-dwelling women, known as casket or casquette girls, because they brought all their possessions to the colonies in a small trunk or casket. France also sent women convicted along with their debtor husbands, and in 1719, deported 209 women felons "who were of a character to be sent to the French settlement in Louisiana." (France also relocated young women orphans known as King's Daughters (French: filles du roi) to their colonies for marriage: to both Canada and Louisiana.)