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_1847180_3 (state__class_ VARCHAR, date_of_successors_formal_installation VARCHAR)
### Question:
What was the state (class) where the new successor was formally installed on May 11, 1966?
### Answer:
SELECT state__class_ FROM table_1847180_3 WHERE date_of_successors_formal_installation = "May 11, 1966"