A paragraph on The exploration and the age of discovery

In the 100 years from the mid-15th to the mid-16th century, a combination of circumstances stimulated men to seek new routes, and it was new routes rather than new lands that filled the minds of kings and commoners, scholars and seamen. First, toward the end of the 14th century, the vast empire of the Mongols was breaking up; thus, Western merchants could no longer be assured of safe-conduct along the land routes. Second, the Ottoman Turks and the Venetians controlled commercial access to the Mediterranean and the ancient sea routes from the East. Third, new nations on the Atlantic shores of Europe were now ready to seek overseas trade and adventure.

Explanation:

these civilizations were located around fertile rivers, where they could produce an abundance of crops

people had jobs and began to work. that’s why the commercial revolution was great.