What hypothesis might you form based on the fact that a primitive language has never been discovered

I'd assume as there is no evidence of a primitive language, there wasn't one and/or they only communicated verbally and had no writing system.

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.