If there are 3 actual racial groups, caucasian, mongoloid, neg roid, where do hispanics fall?

Hispanic is not a race, it's culture made up different races and mixtures that all have a common link, the Spanish Language. The term "Hispanic" didn't even exist until the 1980 U.S. census when it became obvious that people from Spanish speaking backgrounds were ethnically and culturally very diverse. When Columbus claimed the new world for Spain, there was only only one race here,... Native Americans. Some of the Spanish explorers and settlers that followed, eventually mixed with the Native Americans and the Mestizo (European mixed with Indian) race was born. The Spaniards and the Portuguese imported African slaves to work on the sugar and tobacco plantations of the Carri bean and Brazil. Eventually there was some mixing and Mulatto race was born. However, there are still many Spanish speakers in the U.S. and Latin America whose ancestors never mixed and are of pure European Spanish descent and are are therefore, Caucasian.