Database: formula_1
Question: How many American drivers have puncture status.
SQL: SELECT COUNT(T1.driverId) FROM drivers AS T1 INNER JOIN results AS T2 on T1.driverId = T2.driverId INNER JOIN status AS T3 on T2.statusId = T3.statusId WHERE T3.status = 'Puncture' AND T1.nationality = 'American'