Hispanic isn't a race but a linguistic category. Hispanics can be fully European/White like Spaniards, fully Indigenous like Amerindians, fully Black like descendants of slaves, half Indigenous and half European like Mestizos, half Black and half White like Mulattos, 3/4th European and 1/4th Indigenous like Castizos and anything you can think of. Hispanic literally means Spanish speaker, it is no different from calling all English speakers Anglos.