Ahhh the benevolent whitey argument.

Imagine not knowing that copper, iron working, textiles had existed in 'Africa' (a huge place with lots of diversity, complex and not complex cultures)

Imagine not knowing about the Mali, Songhai, or Ghanan empires.

Imagine not knowing that cattle, sheep, goats, agriculture existed since 2500bce in Africa. (Research the Dhar Tichitt site)

Imagine not knowing the most "primitive" of African empires/kingdom the Kingdom of Kongo had textiles, copper mining, for example, King Alphonso of the Kongo sent a bunch of copper bracelets to try to secure an alliance with the Portuguese. Additionally, in 1536 the king of Kongo didn't allow Portuguese and Dutch traders to travel to their copper mines, afraid they would take them.

Even if you take the most primitive of African nation's (Kingdom of Kongo) you find your assertion of: no agriculture, no domesticated animals, no mining, is false and lacks research.

You need to research and study more, your IQ is showing.