In 1790, "United States" was a plural construction. And the federal government didn't bulldoze States' citizenship requirements until the Warren Court did it to achieve a political end, viz., the enabling and empowerment of transients and drifters to register and vote Democratic.
Sorry, but this is just plain wrong. The states' rules of citizenship applied only to those matters that were the state's concern. From St. George Tucker, "the rights intended to be conferred by this uniform rule of naturalization, should be, in general, confined to such as might be derived from the federal government, without infringing those rights which peculiarly appertain to the states. Thus a person naturalized pursuant to the laws of the United States, would undoubtedly acquire every right that any other citizen possesses, as a citizen of the United States."
US citizenship has always been a matter for the United States government to ascertain, and people have been naturalized as US citizens since the founding of the Republic, and not as an incidental to their obtaining citizenship in a state.