Can someone sum up Christopher Columbus's expedition in a few sentences?

Columbus mistakenly stumbled upon a series of islands that he thought were in Asia, but were actually near North America. He encountered the indigenous peoples of these islands, inquired about the existence of gold and silver in the area, and upon discovering that at least some gold was available, used his superior military technology and brutal coercion tactics to force the native people to mine so that he would have riches to take back to Spain. While he was here he and his crew brutalized the population and spread diseases that wiped out most of them within a few generations.