What impact did Christopher have on the world?

Answer 1

Christopher Columbus sailed across the Arctic Ocean and ended up in North-America expecting India. He named the natives "Indians" (today popularly named Amerindians, American Indians or Native Americans).
If Christopher had not "discovered" (he did not discover America, and who that really was I don't remember) America, it is most likely that The Mayflower would have travelled from multiple countries many years later than it did.
Had Columbus not come to America, it may not have been inhabited by foreigners for years and maybe even several decades, and the natives could have lived in peace much longer.
As you may know, the government in the US nearly refuses to give the descendants of multiple tribes their ancestors' land back merely because it is "valuable" (for oil and other money-making purposes).
Had Christopher Columbus not "discovered" America, it may have been a better time for the natives. But who knows.