Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_225205_3 (state__class_ VARCHAR, reason_for_change VARCHAR)

### Question ###
Name the state class for  iowa admitted to the union december 28, 1846

### Accurate SQL ###

SELECT state__class_ FROM table_225205_3 WHERE reason_for_change = "Iowa admitted to the Union December 28, 1846"