Someone comes in and knows only French. You have studied French all your life. You could help them get their medical care or what they need. Foreign languages could help you get into a good college. If you wanted to get accepted to any college, you would have to study a foreign language.
Some colleges even consider sign language a foreign language.
Another reason to study foreign languages is to become culturally diverse. Culturally diverse means you are knowledgeable about another country's language and also their way of life. So, you could prepare by learning Spanish, even if it is just the basics like hello and goodbye. Many people from Mexico and Cuba are moving into the U. S. Most of them speak Spanish. You could welcome them if you knew Spanish, so they would feel at home.