Answer:
Vasco De Gama's discovery of the sea route to India.
Explanation:
Christopher Columbus discovered American continent in 1492 while searching for the sea route to India, while sailing towards the West. While Columbus was certain that he reached the shores of India other explorers weren't that convinced. Among them was Vasco de Gama, a Portuguese explorer who was actually the first one that reached the shores of India while sailing around Africa. That happened in 1498.
