user: Question: What is the round number when nationality was united states, and player is jeffrey foss?
Columns: ['Round', 'Pick', 'Player', 'Position', 'Nationality', 'College']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '7 (from Toronto via NY Islanders)', 'Colin Wilson', '(C)', 'United States', 'Boston University ( Hockey East )']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Nationality" = 'united states' AND "Player" = 'jeffrey foss';