The section 1, article 5 of the constitution of the United States of America bears the Full faith and credit clause, which highlights that the states within the country have duty to respect the judicial proceedings, public acts and records of every other state. A continental congress committee reported in 1781 that one of the things required by this clause of the constitution is that the operation of the judicial proceedings and the act of one state’s court contravenes those of the other states where they are being declared.
I think the Supreme Courts interpretations of free speech have become more libertarian over time. For example, free speech on LGBT matters would have been strictly prohibited a century ago.
