The correct answer to this open question is the following.
Although there are no references attached, we can say that Channing thought that Americans were wrong because they boasted about their rapid growth. We are talking about William E. Channey (1780-1842), an American preacher who was known for the passion of his speeches and the eloquence in his teachings about the one God. He was one of the most important preachers in what was known as "Unitarianism," the prominent figure of Almighty God over the son and the holy spirit.