The Feudal system, since it killed off most of the peasant workers, leaving the gentry with no one to tend to their land.
It reduced Athens' military strength, which added to its later losses in Sicily and subsequent battles helped significantly weaken Athens fighting capabilities.
some studies have revealed that it does weaken the immune system
How am I supposed to know, ask a scientist or how about consulting a medical book, it should help
The daimyo help weaken the shogun by fighting to break free the shogun's control.
The Black Death weakened the feudal system for a couple of reasons. First, the peasants found it possible to move outside their class. They formed the merchant class and made a profit from selling and trading goods. Second, after the plague, the peasants began to realize that even the nobles were not protected from the plague. They originally thought that God was protecting them, but the plague changed their point of view. Slowly, the feudal system collapsed and an oligarchy system was formed instead.
No
The head injury and age are two things that weaken the nervous system. Hard and manual jobs also weaken the nervous system.
because the disease would spread through everyone and kill the counrty or the empire off
Southern planters believed that if slaves learned to read, it would weaken the system of slavery.
Yes. Anorexia can weaken the lungs. It can also weaken the immune system, making the body more prone to respiratory infections.
The continental system.
Yes it will.