Your statement suggests that governments have all powers not expressly denied them in the constitution. Such a belief puts you at odds with the Ninth Amendment of the U.S. Constitution.
I'm amazed at how overlooked the Ninth Amendment actually is. Its importance belies the relatively high number it holds in the Bill of Rights.
In my opinion, it is one of the most important. Without it, the Federal Government could just invent new powers for itself at a whim. The Ninth is the last stand against tyranny, giving freedom the benefit of the doubt where the Constitution is silent.
Absolutely.