The European discovery of America opened up a New World to Western Christendom.
Although Vikings had colonized Greenland and visited Canada, news of these lands was unknown to other Europeans. The Eurasian and African continents were the only land masses known to Western civilization throughout Medieval times and into the Renaissance. Even the true circumference of the Earth was not clearly known.
Expeditions by Columbus, Balboa and others led to the discovery of the Americas and the remnants of the Aztec and Mayan civilizations.
Columbus wanted to find a shorter ocean route to India and proclaimed the places and people he discovered to be "Indian", giving modern English the term "Indians" for the Native Americans.
Toynbee wrote: