In competitive ballroom dance the term Latin has a very specific meaning as the five dances that are danced as International Latin Five Dance round. This round consists of Cha Cha, Samba, Rumba, Paso Doble and Jive.
Since our main purpose is match music to styles of dance, this isn't a particularly useful categorization. Instead, we are broadly grouping the dance styles that derive from Spain and Latin America as Latin. This gives a useful spectrum of tempos of similarly styled music that can be mapped to the various Latin dances. Note that we've pulled out the Tangos into their own category as there enough different styles of Tango each danced to similar music at slightly different tempi that they create a cohesive unit. There is some argument that the same should be done for other sub-groups of Latin dances and music. For instance Bolero, International Rumba and American Rumba create a spectrum of tempi from about 25 to 36 measures per minute all danced to a similar style music. And Samba and Bossa Nova create a natural subcategory of Brazilian music with a similar feel at different tempi.