Plan B said:
I think Caucasian men are very open to interracial relationships(ex:Asian women), but Black women simply won't give white men a chance, in the same way that white women won't give asian men a chance. (for the most part)
Hmph, I've had two 'black' girlfriends that hit nearly the year mark, and a couple of other flings. Women are women. The only thing that makes it harder to meet people of different cultures are our differing cultural norms and institutions... You don't meet many non-white-folk if all you do is hang out at traditional-white-meccas. If you're hanging out in the mixing bowl of meta-Canadian (or Torontonian) culture you really shouldn't have that much trouble.
Women are women. Even when you strip away commonalities of religion, and music, and festivals you can still pretty much count on the fact that they want to feel loved, respected, and protected (Except for when they don't

). Build on the commonalities that you do have.
This is a big generalization, but:
One thing I have noticed, is that the 'white' notion of 'protected' seems to exist only in the financial sense. Modern white guys are very much encouraged to be touchy feely, passive, compromisers. I've found that this doesn't necessarily play that well black girls ('respect'), or Latin American girls ('machismo') [Not that I have much real experience with Latin girls]. The fact that we're often comparatively reliable and often treat them better is often a plus for white guys, but 'whiny', 'needy', and 'indecisive' is often disconcerting from a 'protected' point of view. Oddly enough this may play in white guys favour with Asian girls.
Now, with that horrible mass of generalizations out of the way, many white girls are basically the same...
At the end of the day, women are women.
edit: 'whiny', 'needy', and 'indecisive' don't play well with any woman after a certain point, the trick is finding that point.
edit 2: If the 'cultural norms' don't get you, then the rejection of those norms will. I think the best example of this is probably 'Recovering Catholic Quebecois'.
edit 3: With the above being said, being in Toronto, in Ontario, in Canada is often enough common ground to form a relationship for any two people who leave their respective communities at all.