In the post there is the text about Trump:
He claimed powers never envisioned by the Constitution and insisted his "authority is total" to order states and cities to get moving again to break out of the frozen economy. His warning came as two blocs of Eastern and Western hot-spot states banded together in an implied challenge to his vow to get people back to work soon, setting off a brewing confrontation over the power of the federal government.
The full text you can find here
I have 3 questions:
1) Does "powers never envisioned by the Constitution" mean "powers of USA is never set by Constitution"? And why is "power" in plural here?
2) What does "to break out" mean here and why there is "of"? I can find "to break out" in dictionary but not "to break out of".
3) Please, explain me "over" in text. I can guess "brewing confrontation over the power of the federal government" is meaning "brewing confrontation for the power of the federal government" or "brewing confrontation between the power of the federal government".