Anyone who descends from a Spanish or formerly Spanish colony (with the exception of the Southwest US) or Spain. "Hispanic" is simply an ethnicity, NOT a race. Hispanics are mostly mestizo (of white and Amerindian descent) in most Spanish-speaking countries, with the exception of Spain and Argentina (whose populations are mostly white.) Spain's people are mixed Mediterranean and Nordic/Aryan.
Hispanics in the SW US are mostly bilingual, but futher north, they just speak English.