Table schema:
CREATE TABLE table_name_73 (round VARCHAR, draft VARCHAR, pick VARCHAR, nationality VARCHAR, position VARCHAR)

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