The word, tango, is Argentine Spanish and is believed to come from a term describing an African-American drum dance.
Bolivia has three official languages one of which is Spanish. The other are Indian languages one is called Aymara and the other is called Quechua. About one third of the people speak Spanish. But, most natural born Bolivians speak either of the two orignal native languages.
Paraguay differs significantly even from other multilingual Latin American nations like neighboring Bolivia, where a majority of the population is indigenous. Languages like Quechua and Aymara are spoken by different groups there, but rarely by people of mixed ancestry or the traditional elite.