Find the country that the most papers are affiliated with.
SELECT t1.country FROM inst AS t1 JOIN authorship AS t2 ON t1.instid  =  t2.instid JOIN papers AS t3 ON t2.paperid  =  t3.paperid GROUP BY t1.country ORDER BY count(*) DESC LIMIT 1
SELECT t1.country FROM inst AS t1 JOIN authorship AS t2 ON t1.instid  =  t2.instid JOIN papers AS t3 ON t2.paperid  =  t3.paperid GROUP BY t1.country ORDER BY count(*) DESC LIMIT 1
[{'country': 'USA'}]