am a united state citizen, my daughter was born in santo domingo, am not married to the mother how can i apply to make her a us citizen

More information is needed. Your daughter may be a citizen by birth to you or you may need to sponsor her for lawful permanent residence. For your daughter to be a citizen, you must establish a blood relationship by clear and convincing evidence, you must have been a citizen at the time of her birth, you must agree to provide financial support to her until she reaches the age of 18, and your daughter must be legitimized prior to her 18th birthday. Assuming she is eligible, you would simply apply for a passport. Once in the U.S., she should also request a certificate of citizenship. You can read more at http://myattorneyusa.com/deriving-citizenship-through-parents-at-birth.