At the beginning of the 1400s, people believed the world was flat. Still many trade links beyond Europe, with silks, spice and cotton being in high demand. Trade became more difficult when the Ottomans expanded their empire in Eastern Europe. Placed a high tax on all goods that travelled through their empire. The Europeans needed to find alternative routes for trade which led to an increased interest in exploration.
Encouraged by the development of new technologies. E.g. Printing press, astroglobe, magnetic compass.