The base languages that originated in Europe are Eurasian and Georgian. The Eurasian structure includes the Indo-European language, which later evolved into the Romance, Proto-Germanic and Proto-Slavic language families in different parts of Europe. The Georgian language structure is believed to have branched off of the Eurasian structure between 1100 and 1700 B.C.E.
Ruhlen's language taxonomy divides the African continent into four base language structures: Afro-Asiatic, Nilo-Saharan, Niger-Congo and Khoisan. Afro-Asiatic is the base language for African languages spoken North of the Sahara. Milo-Saharan is the base language structure in the Nile River and Congo regions. The Niger-Congo language structure includes the Bantu languages. The Khoi-san family originated in the Kalahari desert in modern-day Tanzania and Namibia.
The East Asian base languages include Cauco-Sinitic, Hmong and Dravidian. The Cauco-Sinitic group originated in China and the surrounding region and includes all Sino-Tibetan and Caucasian dialects. The Hmong language structure split off around 2500 B.C.E. and includes the dialects of Southeast Asia (Vietnam, Laos, Cambodia, Thailand and surrounding islands). The Dravidian language structure comprises the languages spoken on the Indian subcontinent. Indonesia has its own base language, known as Indo-Pacific.
The Native American base language structure is known as Amerind. The Amerind language structure is believed to have developed between 2400 and 2800 B.C.E. in Central and South America. Kuhlen's hypothesis that all native languages in this region share a common ancestor is somewhat controversial, as many linguists point out the striking differences between languages.