Christopher Columbus was a Genoese sea captain who, in 1492, approached Queen Isabella with an interesting plan, which was to try to find a new route to India by sailing west across the Atlantic Ocean. In August 1492, Columbus sailed west across the Atlantic towards what he thought would be India, but little did he know he'd find our present day America. On October 12th, 1492 a lookout aboard the Pinta spotted land, which was the present day Bahamas. The natives greated Columbus with open arms and, not knowing he wasn't actually in India, he called them the "Indians". In 1493, Columbus returned to Spain to report his findings and he later sailed back to the Americas three more times to try and transform the islands that he and his crew had found into Spanish colonies.
There are a lot of people throughout history that have changed the world, but in my mind Christopher Columbus was one of the most important of those people. He was the first explorer to find the Americas and their inhabitants. If he hadn't accidentally stumbled upon our, now present day, America who knows how our lives would be right now. The chain of events leading up to present day could be drastically altered if, say, Franscisco Pizzaro had found the Americas. Finding two huge continents that no one except the inhabitants knew were there seems like a pretty good world changing event to me.
In 1492 Columbus set sail as an explorer for Spain and was at sea looking for a new route to India, that he thought he would find if he sailed west over the Atlantic Ocean, for a little over a month. Once he landed on the Bahamas he named the local inhabitants, that were living there at the time, Indians because he thought that he was actually in India and not in a new land that no one in Europe knew about. So, there is one way right there as to how Christopher Columbus changed the world. He gave the world a name for Indians, which mostly everybody in the entire world knows. So the simple name that he came up with then is now a world wide know name.
The main and most obvious reason as to how Columbus changed the world is that he found the Americas. If he hadn't found the Americas for Spain and anothr explorer from say a country in Africa had found the Americas then our present day lives would most likely be drastically altered. We could have a completely different form of government and we might have completely different states, we might have more or less than fifty states. We might've even been just one large state instead of fifty individual states. If Columbus hadn't found the Americas and some other explorer had then we might not even be free. So, if Columbus hadn't found the Americas then our everyday lives that we know and love might not even exist.
So, simply put, Columbus affected the world in a huge way without even knowing what he had done. He found that land that would later come to be the great land of the United States of America. He named the inhabitants of the new land and gave the world a name known around the planet. Also, because he found the Americas, he, in a way, gave us our way of life that we live and love everyday. Who would've guessed that, by accidentally stumbling across the Americas, Christopher Columbus would've had such a huge affect on the world, in the past and now in the present day.