How many American cars have an acceleration time of less than 12 seconds?
American car refers to country = 'USA'; an acceleration time of less than 12 seconds refers to acceleration < 12
SELECT COUNT(*) FROM data AS T1 INNER JOIN production AS T2 ON T1.ID = T2.ID INNER JOIN country AS T3 ON T3.origin = T2.country WHERE T3.country = 'USA' AND T1.acceleration < 12