Answer:
it's a propaganda all of it
Black Death was spread mainly through the fleas on rats. Fleas would bite the infected rat, then jump onto humans, biting them and causing them to become infected. Rats were mostly found on ships than running around on land
It makes them more independent. If they had a limitless amount of terms, they could just vote for whatever was suitable at that time and keep their political power. Since they won't be able to stay in the congress longer, then they can vote whatever they want because there's nothing that will affect whether or not they get elected again.
Force work the problems faced by Germany when it was unified in 1990