The two main reasons for finding another trade route were religious and economics.
Step-by-step explanation:
Silk route is the trade route which connects China and other Asian countries to the west and European countries. It connected the Europe and Mediterranean countries with the Asian countries. Silk was the main trading item that was traded in ancient days along the silk road. Spices, livestock, perfumes were also traded along this route.
Ancient Romans were the first to know that China knew the fact of producing silk and they traded silk with China for exchange of gold and silver. the route was a rugged terrain with harsh climate and along with trade it opened gates for the entry of many diseases which affected the people. After the age of exploration, explorers found alternative trade routes to Asia and the driving force behind the search of the explorers were religious and economic reasons.