What caused this?

>>937070152
Because they are a tumor festering on my great civilization. Everywhere they spread filth, decadence and corruption follows. Niggers are demons in the flesh and humanity will not spread its wings if it doesn't cut this tumor out

>>17799879
>Was it just iq
Obviously

Are all cultures equal?

How come some races like Africans never learnt how to farm or produce metal? Their greatest achievement was a leaf or mud hut while whites sent men to the moon.
Is low iq the reason or something else?