Please list the names of all the universities that scored under 60 in teaching in 2011 and are in the United States of America.
scored under 60 refers to score < 60; in 2011 refers to year 2011; in teaching refers to criteria_name = 'Teaching'; in the United States of America refers to country_name = 'United States of America';
SELECT T3.university_name FROM ranking_criteria AS T1 INNER JOIN university_ranking_year AS T2 ON T1.id = T2.ranking_criteria_id INNER JOIN university AS T3 ON T3.id = T2.university_id INNER JOIN country AS T4 ON T4.id = T3.country_id WHERE T4.country_name = 'United States of America' AND T2.year = 2011 AND T2.score < 60 AND T1.criteria_name = 'Teaching'