user: Question: What was the lowest pick number for a United States player picked before round 7?
Columns: ['Round', 'Pick', 'Player', 'Nationality', 'College/junior/club team']
Types: ['real', 'real', 'text', 'text', 'text']
Sample row: [1.0, 11.0, 'Brad Marsh (D)', 'Canada', 'London Knights ( OHA )']
SQL:

assistant: SELECT MIN("Pick") FROM "Table" WHERE "Round" > 7.0 AND "Nationality" = 'United States';