I don't think that Mencken considered himself a humorist. I don't think anyone did. He had his own magazine, The American Mercury (Mercury/Hermes was the god of business) which became a violently rightwing McCarthyist rag by the 1950's, and then vanished. Funny it was not.
Rogers was indeed a humorist. He started out as a cowboy act in which he did rope tricks. Then he combined his rope tricks with a running dialogue. Rogers was part Cherokee. His family was part of the Cherokee leadership, and after Rogers, any Americans who claimed Indian blood tended to claim they were related to some Cherokee princess.
His son became a US Representative rfor one term, from CA.