Swahili language
The exact number of Swahili speakers, be it native or second-language speakers, is unknown and a matter of debate. Various estimates have been put forward and they vary widely, from 50 million to over 100 million. Swahili serves as a national language of four nations: Tanzania, Kenya, Uganda, and the DRC. Shikomor, the official language in Comoros and also spoken in Mayotte (), is related to Swahili. Swahili is also one of the working languages of the African Union and officially recognised as a lingua franca of the East African Community. South Africa legalized the teaching of Swahili in South African schools as an optional subject beginning in 2020.
Languages of Argentina
Several Native American languages spoken in Argentina by the native people (1% of the population) are declining at rates that may result in only a handful of speakers within a generation. Kaiwá has 512 speakers, Nivaclé 200, Tapieté and Wichí Lhamtés Nocten only 100. These indigenous languages have suffered slow linguistic and cultural genocide. In this category in terms of number of speakers, one can also include some immigrant languages for instance Plautdietsch with only 140.