There is only one title from the TW series available as a native Mac port, and that is Rome:TW from Feral Interactive.
pevergreen may be right in saying that Steam may have a Mac push, but I fear this would be for the many games with Mac versions (paradox are especially good in this area). I'm a long time Mac user and I haven't heard anything about CA allowing more ports of their games. I'd be very happy, but I'm not currently hopeful.
As noted, you can dual boot using a copy of Windows under Boot Camp.
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