Write SQL query to solve given problem: Which United States province is home to the greatest number of corporations' corporate headquarters?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T1.Province FROM country AS T1 INNER JOIN organization AS T2 ON T1.Code = T2.Country WHERE T1.Name = 'United States' GROUP BY T1.Province ORDER BY COUNT(T1.Name) DESC LIMIT 1