The process of this split is called binary fission.. Some unicellular organisms don't use fission, but rather budding. The difference is that budding produces a smaller cell rather than one that is equal in size. Unicellular organisms that reproduce are called a mother cell and the smaller one is called the daughter.
Second, Hispanic is an ethnic group consisting of people who speak a form of Spanish and were conquered by Spain at some point. So this covers most of South America (excluding countries like Brazil and Guyana), Central America and part of the Caribbean (the Dominican Republic, Cuba and Puerto Rico).
For us, a black american is an american, exactly as a white one. A person with american native look, is southamerican/latino if he speaks with any of the many south american accents, or spanish if he speaks with one of the many spanish accent. Same happens with white people. A black with perfect spanish accent is spanish. A unusually darker one, or whatever, but spanish.