23.1
zonal
Sahara
sahel
harmattan
tsetse fly
Niger River
bauxite
23.2
archaeology
oral history
kola
800 AD
Mansa Musa
Songhay
1440's
slave trade
1800's
1820's
WWII
1950's
1960's
1974
1996
animism
23.3
herd animals
millet
sorghum
cotton
malaria
staple crop
1950's
1990's
23.4
1960's
secede
1970's
oil
Wolof
griots
1980's
Ivory Coast
cacao
