How many years was there a team that was part of the usisl pro league?
CREATE TABLE table_name_38 (year VARCHAR, league VARCHAR)
SELECT COUNT(year) FROM table_name_38 WHERE league = "usisl pro league"
### Context: CREATE TABLE table_name_38 (year VARCHAR, league VARCHAR) ### Question: How many years was there a team that was part of the usisl pro league? ### Answer: SELECT COUNT(year) FROM table_name_38 WHERE league = "usisl pro league"