In the early 20th century, fiscal conservatives were often at odds with progressives who desired economic reform. During the 1920s, Republican President Calvin Coolidge's pro-business economic policies were credited for the successful period of economic growth known as the Roaring Twenties. However, his actions may have been due more to a sense of federalism than fiscal conservatism as Robert Sobel notes: "As Governor of Massachusetts, Coolidge supported wages and hours legislation, opposed child labor, imposed economic controls during World War I, favored safety measures in factories, and even worker representation on corporate boards".