We, as Americans, are very diverse. Many people from other countries come to America fro opportunities, and other more. For example, long ago, Ireland was in a potato famine. Due to this, Irish people came to America mostly for food. But seriously, there are different reasons why people come to America. Also, differences is a unique word actually. I guess from this question you are talking about different race and people, I guess. But if I am wrong, just tell me in the comments, and I'll fix it. I'll also give you a totally new answer. Above all, our differences actually define US.
Providing background on the Renaissance would allow Charlie to talk about the shared history. This leads to talking about the effect the period had on art, and then specifically on the artists mentioned.
In the story "The Cask of Amontillado, Montressor had led Fortunato in a family of catacombs. He had led him to a pile of skeletons and chained Fortunato's arm. No one knows what happened to Fortunato at the end. All they know is that Fortunato disappeared, and no one ever saw him again.