Columbus ended up 'discovering' the continents that we now call the Americas.
His 'discovery' led to many other explorers from Spain, and later on Portugal, to make the journey and grab land for their monarchs.
The New World was rich in resources - gold and silver, but also timber and furs - which were taken by the European colonists, developing trade and wealth for the European powers.
Over time, other European countries began to colonise the New World - especially England, France and the Netherlands. This led to European domination of the Americas.