BS! Show me that language in the Constitution and you win! Simple as that!
Try again!
OK.
The power to admit a state: Article IV, Section 3 "New States may be admitted by the Congress into this Union..."
The power to approve states combining or splitting up: Article IV, Section 3: "but no new States shall be formed or erected within the Jurisdiction of any other State; nor any State be formed by the Junction of two or more States, or parts of States, without the Consent of the Legislatures of the States concerned as well as of the Congress."
The power to approve any change in the border of a state: Article I, Section 10 "No State shall, without the Consent of Congress,...enter into any Agreement or Compact with another State, or with a foreign Power" prevents Texas, for example, from working out a border change with Mexico since that would be a treaty as well as preventing Texas from working out a border change with Oklahoma.
All other changes in status require Congressional approval, by implication leaving does as well.
BTW, you figured out if the Air Force or NASA are Constitutional yet?