The American trade union movement was largely a Northern phenomenon at the time of its inception, with the first continuous organization for the advancement of wages emerging among the shoemakers of Philadelphia in 1792. This was followed by the printers of New York City in 1794, and various groups of shoemakers and printers in the Northern cities of Baltimore, Pittsburgh, Boston, Albany, and Washington, D.C. in the years up to 1809. It was not until 1810 that the first Southern American trade union emerged, that being an organization of the printers of New Orleans.