Board Thread:Skyrim/@comment-11344160-20160205154012/@comment-1600847-20160914163810

Blademaster Jauffre wrote: Do you have anything to prove that they joined peacefully? An army joined him, nothing else, we have TESA saying that the Kingdoms of Tamriel opposed Tiber's Empire, so that's what we have to go with. I don't, that's why I'm asking.

Also, that Redguard thing is a unlikely. Tiber was opposed in Hammerfell by a rebel movement due to his double-cross at the Battle of Stros 'Mkai and Richton's brutality as governor, but there's no evidence of any opposition post-conquest in the other provinces, even in the former Dominion provinces. If there was rebellion and unrest "on all sides", you'd think there'd be some evidence of it beyond one line from Redguard.

Also, it doesn't mention Skyrim specifically, unlike the other provinces to which each has at least one specific mention of opposing Tiber.