Historians in the 1930s and 1940s often disparaged the Second Empire as a precursor of fascism. That interpretation is no longer promulgated, and by the late 20th century they were celebrating it as leading example of a modernising regime. Historians have generally given the Empire negative evaluations on its foreign policy, and somewhat more positive evaluations of domestic policies, especially after Napoleon III liberalised his rule after 1858. He promoted French business and exports. The greatest achievements came in material improvements, in the form of a grand railway network that facilitated commerce and tied the nation together and centered it on Paris. It had the effect of stimulating economic growth, and bringing prosperity to most regions of the country. The Second Empire is given high credit for the rebuilding of Paris with broad boulevards, striking public buildings, and very attractive residential districts for upscale Parisians.