List the all the institutes from the state with the most number of American Indian in 2007.
institutes refers to chronname; American Indian refers to race = 'Ai'; most number of American Indian refers to MAX(COUNT(race = 'Ai')); in 2007 refers to year = '2007';
SELECT T1.chronname FROM institution_details AS T1 INNER JOIN state_sector_grads AS T2 ON T1.state = T2.state WHERE T2.year = 2007 AND T2.race = 'Ai' GROUP BY T1.chronname ORDER BY COUNT(T1.chronname) DESC LIMIT 1