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
The modern development of today's world would have first made the routes safer. Today we have the safety of common things such as police officers, hospitals, e.t.c. Transportation of goods would have been easier, and it would have been easier to carry larger amounts of goods at one time.
hope this helps :)
Germany was an economic rival of Great Britain in World War 1
because of the spirit of international competitiveness and
imperialism. Each wanted to establish supremacy in Europe and
therefore, they tried to outgrow each others' economy.
I believe that would be Genghis Khan