What is boserup’s thesis about agricultural methods centuries ago affecting gender attitudes now an example of?

It is an example of "distal cause".

The distal causes are the first inaccessible causative variables, in the first condition. Proximal causes can be considered as present causative elements, which incorporate the cognizant personality and it's impact.  

Distal resembles far off: far path from. A distal cause is far away in time or place for its impact.  

A distal risk factor is a hazard factor that speaks to a hidden helplessness for a specific condition or occasion. This does not foresee that the condition or occasion will occur or that it will happen at any point in the near future, yet rather that a man might be in danger for the condition sooner or later.

answer; no longer than a reasonable period of time;