What was the earliest year for the USISL Pro League?
CREATE TABLE table_name_52 (year INTEGER, league VARCHAR)
SELECT MIN(year) FROM table_name_52 WHERE league = "usisl pro league"
### Context: CREATE TABLE table_name_52 (year INTEGER, league VARCHAR) ### Question: What was the earliest year for the USISL Pro League? ### Answer: SELECT MIN(year) FROM table_name_52 WHERE league = "usisl pro league"