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_1715730_2 ( founded VARCHAR, institution VARCHAR )

### Question ###
what is the year union university was founded?

### Accurate SQL ###

SELECT founded FROM table_1715730_2 WHERE institution = "Union University"