text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_2417340_3 (state__class_ VARCHAR, date_of_successors_formal_installation VARCHAR)
  ### Question:
  List all state classes when successors were formally installed on June 22, 1868.
  ### Answer:
  SELECT state__class_ FROM table_2417340_3 WHERE date_of_successors_formal_installation = "June 22, 1868"