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"Hispanic" is a very poorly-defined race. In the United States, anyone from the palest Jew from Argentina to the darkest baseball player from the Dominican Republic is considered Hispanic simply because they speak the same language. Basing a race on language is foolish.
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Yes, that's why Hispanic was eliminated as a race in the 2000 U.S. Census. Yet it is still commonly used (eg. on affirmative action checklists).
And the same can be said for all the "official" races recognized by the U.S. None is a monophyletic grouping.
I think the best interpretation of human genetic variation is a clinal interpretation: most traits vary clinally (ie. gradually) from place to place. There are no sharp distinctions, no boundaries, and no barriers to complete mixing.