A question about the difference between "what" and "which"

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Aug 14, 2009 08:41
The other day I found a sentence in a journal which I was a bit confused with.
It said," Which famous American actor has his 72th birthday today?" The answer is "Dustin Hoffman"( August 8th)
When I read this, a question occurred tome," Which American famous actor not what American famous actor?"
I was wondering if I could say "what American...".
To use "which" sounds easy, but it is difficult to know the difference in nuance between the two.
When you say" どのアメリカ人の有名な俳優が今日誕生日を迎えますか"、”どの”sounds equal to "what" (何の)to me.
So my question here is the difference in nuance between the two below:
1. What American accent do you have?
2. Which American accent do you have?
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3.What famous American actor has his 72th birthday today?
4. Which famous American actor has his 72th birthday today?

The weather Aichi Pref. in Japan is fine and the wind is very cozy and like an autumn.

Thanks in advance for your corrections and ideas.
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