user: Question: What is the round of the Defense player from the United States?
Columns: ['Round', 'Player', 'Position', 'Nationality', 'College/Junior/Club Team']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Pat Falloon', 'Right Wing', 'Canada', 'Spokane Chiefs (WHL)']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Position" = 'Defense' AND "Nationality" = 'United States';