ลีกอะไรมาจากอเมริกาและรอบเล็กกว่า 12
What league is from the United States and a round smaller than 12.
df = pd.DataFrame(columns=['college_junior_club_team__league_', 'nationality', 'round'])
df[(df['nationality'] == 'united states') & (df['round'] < 12)]['college_junior_club_team__league_'].values[0]