There are both advantages and disadvantages to everyone speaking the same language. On the one hand, it would be much easier to communicate with others and there would be a greater understanding between people. This would make it easier for people to travel and do business with each other, and could help to break down barriers between people of different cultures. On the other hand, it could also lead to a loss of identity for some people and cultures. Different languages can be used to communicate in different ways, and language is a key part of culture and identity.
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