Quite; but my observation is also vacuously true.
That’s right. The U.S. Constitution and U.S. sovereignty is only within U.S. borders. Seems obvious but maybe not to some.
The tenth amendment is confirming that federal power is expressly limited to that which is delegated by the Constitution.
The Constitution must be read as written and originally understood and intended. There are very important unexpressed assumptions in the Constitution that derive from the Declaration of Independence (DofI). The Constitution is mandatory authority but the DofI is persuasive authority.
More attention needs to be paid to the DofI which would probably help with the idea that the U.S. government is created by and power derived from the citizens of the U.S via the Constitution which has no authority over any other country because it is not tied to the people of any other country.