CREATE TABLE table_15873 ("Player" TEXT, "No." FLOAT, "Nationality" TEXT, "Position" TEXT, "Years in Toronto" TEXT, "School/Club Team" TEXT)

what nationality is the player who played from 1997-98
SELECT "Nationality" FROM table_15873 WHERE "Years in Toronto" = '1997-98'
SELECT "Nationality" FROM "table_15873" WHERE "Years in Toronto" = '1997-98'