user: Question: What is the average round of the RW position player from the United States?
Columns: ['Round', 'Pick', 'Player', 'Position', 'Nationality', 'College/Junior Team']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 12.0, 'Tyler Myers', 'D', 'Canada', 'Kelowna Rockets ( WHL )']
SQL:

assistant: SELECT AVG("Round") FROM "Table" WHERE "Nationality" = 'United States' AND "Position" = 'RW';