Database: hockey
Question: Among the coaches who taught the teams in 1922's Stanley Cup finals, how many of them are from the USA?
SQL: SELECT COUNT(DISTINCT T3.coachID) FROM Coaches AS T1 INNER JOIN TeamsSC AS T2 ON T1.year = T2.year AND T1.tmID = T2.tmID INNER JOIN Master AS T3 ON T1.coachID = T3.coachID WHERE T2.year = 1922 AND T3.birthCountry = 'USA'