Which country finally agreed to sponsor Columbus' voyage?

It is Spain who sponsored the Voyage of Columbus. The king and queen of Spain supported and sponsored Columbus’ voyage because they believe that the voyage may find a shorter route or other detours towards Asia region that existed. Spain has a strong and firm interest and delighted in trading with Asia. If the voyage can discover a shorter route, it can provide an advantage in trading and businesses between Spain and Asia. They also believe that there’s a possibility that Columbus might explore places that are rich in resources and minerals.