Esque la langue unit ou nous divise? If you are not a French speaker that sentence is an example of language's ability to divide us. People who do not speak the same language are often keeping distance from each other, not because they don't want to talk to each other but because they don't have the same ability of communication.
Communication brings people together, but the key of it is to understand each other, therefore if people do not speak the same language they will not be able to have an understandable conversation which going to divide them. I took time to look around my school which is a good example of diversity and I noticed that Spanish speaker will associate with one another, people from Somali will be together and I asked myself why. Therefore I came with the conclusion that language is the main reason that they associate to each other, because they have they ability to understand each other without having any misunderstanding of the language.
language is being able to communicate, if people are not able to understand one another, they will not associate with one another. In conclusion I feel that language divide us, specially when we do not speak the same language.