Think of it like this
Internal: A force inside yourself
External: A force outside of yourself
So if there an external force, it’s a force from outside so an example would be bullying. You wouldn’t want to go where you are being bullied so that would be an outside force affecting you.
The Abame oracle says that white men will come like locusts and that they will spread destruction. The meaning of this is that, just like locusts do, white men will bring no good to the village.
Annie's past tells us that she was a little bit like Helen.
The way Annie deals with Helen shows us that Annie had a lot of patience.