Write SQL query to solve given problem: How many American restaurants are located in Front, San Francisco?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(T2.food_type = 'american') FROM location AS T1 INNER JOIN generalinfo AS T2 ON T1.id_restaurant = T2.id_restaurant WHERE T1.city = 'san francisco' AND T1.street_name = 'front'