What is the relationship between the presence of foreign forces and brain development?

Sharpening the theoretical approach of the Evaluation

What is the relationship between the presence of foreign forces and brain development?

How is this connected, why should there be a brain drain and who should be affected?
It is very vital to connect the causal relations in between and develop a theory to base some serious analysis on this issue.

2. Create at least 6 evaluation Questions that critically scrutinise the effects of western withdrawal on Brain-Drain in Afghanistan.