How did the black death travel from sarai to cairo?

how did the black death travel from sarai to paris?

how many years did it take the black death to spread from sarai to cairo? paris?

The plague sprawled from Sarai to Cairo in 1345 though both land and sea. The ports - Alexandria, Genoa, and ports in Sicily and Cyprus were integral in rapidly spreading the diseases in the Mediterranean region where Cairo is found. The plague had its outbreak in 1348. The Black Death traveled to France primarily down the routes like the Rhone valley in 1348. So the years it took it take the Black death to spread from Sarai to Cairo and Paris is 9 years.

They made a checks and balance system to equal power within the branches. the "check" meant that one branch would watch one branch and "balance" them if they were too powerful. if you want more info on this, i would just google checks and balance system.