logocracy (n.)

"system of government in which words are the ruling powers," 1804; see logo- + -cracy "rule or government by." Popularized by Washington Irving.

In this country [America] every man adopts some particular slang-whanger as the standard of his judgment, and reads everything he writes, if he reads nothing else: which is doubtless the reason why the people of this logocracy are so marvellously enlightened. [Irving, "Salmagundi," 1821]