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_1939214_1 ( year VARCHAR, league VARCHAR )

### Question ###
In what year did the team compete in the USISL Pro League?

### Accurate SQL ###

SELECT year FROM table_1939214_1 WHERE league = "USISL Pro league"