CREATE TABLE table_name_73 (round VARCHAR2, draft VARCHAR2, pick VARCHAR2, nationality VARCHAR2, position VARCHAR2)

In which round was Position G from the United States drafted as Pick 13 in 1971-1 1971?
SELECT round FROM table_name_73 WHERE nationality = "united states" AND position = "g" AND pick = "13" AND draft = "1971-1 1971"
SELECT "round" FROM "table_name_73" WHERE "13" = "pick" AND "1971-1 1971" = "draft" AND "g" = "position" AND "nationality" = "united states"