Why European countries discovered America and not the other way around? Can you provide some reference to justify your response?
European countries did not "discover" America. The continent of Europe has been inhabited for tens if not hundreds of thousands of years by numerous different civilizations, including Native Americans who prior to contact with European explorers were already well established in many parts of North America.

Prior to discovery by Europe, American regions had been visited and documented by people from outside the Americas, such as the Chinese, Japanese, and Western Europeans. However, these visits were typically short and fleeting, and there is little evidence that any of them led to permanent settlement or significant colonization. It wasn't until 1500 CE when Spanish explorer Ferdinand Columbus arrived on the island of Hispaniola (now called Cuba and Puerto Rico) that Westerners became aware of the existence of a large landmass north of South America.

In 1492, Columbus set out on his second voyage, this time attempting to sail directly to India using a newly developed ships' prow known as a "Columbine". However, after losing several ships and encountering severe weather conditions, Columbus returned home to Spain without making it past the Bahamas. Despite this failure, interest in colonizing North America continued in Spain and Portugal. During the following centuries, various groups of Portuguese and Spanish explorers and settlers made repeated attempts to establish colonies along the northeastern coast of the United States, eventually founding what would become the modern-day countries of Canada and the United States.

So while pre-1492 exploration may have taken place in certain parts of America by non-native peoples, it was not enough to establish permanent settlements or significant colonial empires. Instead, it was the arrival of European explorers during the Renaissance and Enlightenment periods that brought about the first true encounters between Europe and the New World, leading to the eventual discovery and colonization of the entire continent.