Question: Action movies are mostly directed by directors of which country?
SQL: SELECT T3.country FROM movies2directors AS T1 INNER JOIN directors AS T2 ON T1.directorid = T2.directorid INNER JOIN movies AS T3 ON T1.movieid = T3.movieid WHERE T1.genre = 'Action' GROUP BY T3.country ORDER BY COUNT(T3.country) DESC LIMIT 1