The sex ratio for the entire United states was less than 100, indicating that there were more females than males. The sex ratio at birth exceeded 1.

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The sex ratio for the entire United states was less than 100, indicating that there were more females than males.  The sex ratio at birth exceeded 1.0 denoting a greater number of male births to female births.  How could one account for the difference between the sex ratio for the United States and sex ratio at birth?

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