Final answer:
The First Crusade disrupted Byzantine trade along the Silk Road to China by causing conflict, but it also expanded maritime trade between East and West, benefiting cities like Venice and creating new trade routes.
Step-by-step explanation:
The question concerns the impact of the First Crusade on Byzantine trade. The First Crusade mainly disrupted Byzantine trade along the Silk Road to China. This was partially because the Crusades, in general, were poorly organized and there were numerous instances in which the crusaders' actions directly conflicted with the interests of the Byzantine Empire. The sacking of Constantinople during the Fourth Crusade, although not part of the First Crusade, significantly weakened the Byzantine Empire's capacity for trade.
However, the First Crusade did help to expand maritime trade between the East and West. As crusaders became aware of Eastern goods like silk and spices, the increased demand led to the prosperity of cities like Venice, which enhanced trade through the establishment of new markets and shipping routes bypassing the Silk Road. This shift had a mixed impact on Byzantine trade, and while it may have disrupted some existing trade dynamics, it also led to the development of new trade opportunities with the West.