Except your false claim of uniformity.
The British common law for libel "presumes in the plaintiff's favour that the words are false, unless and until the defendant proves the contrary."
What state has that as a standard in its common law?
I have no idea, and once again, it is completely irrelevant. The common law definition of burglary is the breaking and entering of a dwelling, at night, with the intent to commit a felony therein. How many states have that common law definition? Zero. The common law was derived from England, not the states. The principles of common law are uniform. The states can get rid of them, change them through statute, use them, or whatever. But the common law is the same.