The city of New Orleans has always been known for its great French heritage, from its founding on 7 May 1718, by the French Mississippi Company till today with the strong influence of its French Quarter and French architecture. During the 1840's -1860's, New Orleans was one of the largest cities in the United States, and probably the largest in the south.
The large french influence was also felt among the Jews of New Orleans. In the marriage records of Congregation Gates of Prayer (FHL film #1012748 item #3), a large number of those being married list their nativity as being France. On the record below, Fanny Bacharach of New Orleans and Michel Schmulen of France were married on 18 Sep 1873. As we turn to the 1880 United States census (http://www.familysearch.org/) we find a little more about the family. Michel and Fanny Schmulen are living with their 2 daughters in St. Mary's parish. Their ages at the time of the census are 44 and 25. Therefore if those are correct they would have been 37 and 18 on the day of the wedding.
The records of the Jews of New Orleans can be found in The Jews of the Americas.