When the U.S. Constitution was finally ready for public review and debate in the late 1780’s, there were many who thought we’d once again overcompensated – this time back towards too much government, and too little freedom. They wanted some sort of written guarantee they wouldn’t be oppressed by this bigger, stronger government.
The authors were appalled at this concern. Obviously any powers not specifically granted to the national government by this document remained with the States and the People thereof! To spell out those protections would be… redundant! Possibly even limiting! What if listing some specifically guaranteed rights implied that they were the only ones entirely secured?! It almost got ugly.