Federalism and Legal Unification: A Comparative Empirical Investigation of Twenty Systems Halberstam, Daniel H. Reimann, Mathias W. WWW Constitutional Law 2014 "Federalism and Legal Unification: Comparing Methods, Results, and Explanations Across Twenty Systems" Halberstam, Daniel H. Reimann, Mathias W. SSRNWWW Constitutional Law Federalism and Legal Unification: A Comparative Empirical Investigation of Twenty Systems 2014