What increased trade and travel in the middle ages?

a: the crusades
b: tales of marco polo
c: travels of kublai khan
d: the christian church

A: The crusades

C: Travels of Kublai Khan

Explanation:

Teh crusades were holy wars fought by the army of the Catholic Church provided by several kingdoms that tried to re-conquer Holy Land, this made it for more and more people to travel to the middle east that increased the trade, as well as the travels of Kublai Khan who traveled through all of Asia, and up to the middle east.

in the 1800s, chinese workers migrated to the united states, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. chinese immigrants were particularly instrumental in building railroads in the american west, and as chinese laborers grew successful in the united states, a number of them became entrepreneurs in their own right. as the numbers of chinese laborers increased, so did the strength of anti-chinese sentiment among other workers in the american economy. this finally resulted in legislation that aimed to limit future immigration of chinese workers to the united states, and threatened to sour diplomatic relations between the united states and china.