If we all came from Adam and Eve, who were white, how did we get Chinese, Blacks, and Mexicans, etc.?

Update: Like Chinese, for instance, how did they get slanted eyes? Adam and Eve didn't have that, so where did different ethnicies come from?
Update 2: To Devil'sadvocate, even if A&E did come from Africa, how do you explain how we got white people?
Update 3: Sorry everyone, I don't know what race adam and eve were, but still, even if they were Chinese or African, or White...how did we get EVERY OTHER race in the world today?
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