The best describe the reason for increased European sailing voyages during the Age of Discovery is explorers were seeking to find new routes to the spice markets of Asia.
Age of Discovery refers to beginning of 15th century and ended in 17th century. In this era most of voyages of pioneer European explorers want to find alternate route to the sources of commodities in "East".
Age of Discovery can happen because in 1453 the Ottoman Empire are winning the war in Constantinople and then the Ottoman Empire take a control for Constantinople and block all land access for European to the area in the East. This make trade limited and commodities become scarce.
Because of that, many European explorers want to find alternate route which is from the sea to the sources of commodities in "East" or Asia.
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