American Empress?
She's a lovely ship, but the name sounds wrong, even un-American. That nation can lay no claim to historic empresses. Indeed, its basic identity as an egalitarian democracy means it takes pride in having no truck with aristocrats.
So why are the ships of this riverboat cruise line called queens and empresses?
It it's meant to work as subliminal advertising, it doesn't. Just sounds like an oxymoron to me.