Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_39 (round INTEGER, nationality VARCHAR, draft VARCHAR)
### Question:
What is Canada's highest round before 1973?
### Answer:
SELECT MAX(round) FROM table_name_39 WHERE nationality = "canada" AND draft < 1973