Maryland Public Secondary Schools Athletic Association (MPSSAA), is the association that oversees public high school sporting contests in the state of Maryland. Organized after World War II in 1946, the MPSSAA is made up of public high schools from each of Maryland's 23 counties and independent city of Baltimore City, which joined the association in 1993 when its public high schools withdrew at the orders of a new Superintendent of Public Instruction (schools) in the Baltimore City Public Schools from the earlier longtime athletic league, the Maryland Scholastic Association (M.S.A.) which was founded in 1919. The MSA had been composed of public high schools in the City of Baltimore and private / religious / independent schools on the secondary level in the City of Baltimore and its metropo