CREATE TABLE table_56295 ("Player" TEXT, "Nationality" TEXT, "Position" TEXT, "Years for Jazz" TEXT, "School/Club Team" TEXT)

Which position has a Nationality of united states, and a Player of roger powell?
SELECT "Position" FROM table_56295 WHERE "Nationality" = 'united states' AND "Player" = 'roger powell'
SELECT "Position" FROM "table_56295" WHERE "Nationality" = 'united states' AND "Player" = 'roger powell'