The Lochner era is a period in American legal history from 1897 to 1937 in which the Supreme Court of the United States is said to have made it a common practice "to strike down economic regulations adopted by a State based on the Court's own notions of the most appropriate means for the State to implement its considered policies". The court did this by using its interpretation of substantive due process to strike down laws held to be infringing on economic liberty or private contract rights. The era takes its name from a 1905 case, Lochner v. New York. The beginning of the era is usually marked earlier, with the Court's decision in Allgeyer v. Louisiana (1897), and its end marked forty years later in the case of West Coast Hotel Co. v. Parrish (1937), which overturned an earlier Lochner-e