SAT Subject Test Scores

Hi everyone! I am applying to Northwestern Early Decision with a double major in English and Economics, and I just had some questions regarding my SAT Subject Test scores. The two tests I have taken are Math 2 and U.S. History. I am going to submit the Math 2 test of a 780, but I don’t know whether to submit my U.S. History test of a 710. I feel that submitting the U.S. History test would be beneficial because I have not taken many Social Studies / History AP classes and the test would help to round out my academic strengths. However, my parents and online materials seem to indicate that a score of a 710 is not worth sending because while it is a good score, it is not great. What are your thoughts on the U.S. History score and whether or not I should submit it to Northwestern?
P.S. I plan on retaking the U.S. History test in December for regular decisions schools in case I don’t get accepted to Northwestern.

The two scores are 69th and 67th percentile, so I’d expect the same decision for both. I’d probably send them, both being relatively neutral to slightly positive in an application.