User blog comment:Johnsmith2962/Skyrim: New DLC idea/@comment-5277784-20120723051949/@comment-3492791-20120831011756

Incorrect.

The White-gold concordat stated that the Dominon would get the southern parts of Hammerfell. Hammerfell rusfused to give them up. So to prevent from violating the tready, the Empire renounced Hammerfell as an Imperial provence.

If Hammerfell was not part of the Empire, they could not be expected to be able to tell them what to do, and thus were not violating the tready.