Some personal experience...

I personally worked at a place where all the employees were South Asian. Everything we did was pretty much similar, how we produced things and how we organized things. We even spoke in Hindi or Urdu, then our manager decided to hire a girl from Mexico. She adjusted to the South Asian environment very quickly. She had new methods of doing things, and we learned a lot from her, which made a significant improvement in the business later on. Therefore, our employer started hiring people that were a minority, which helped in communicating with customers who were not fluent or did not speak English.  This made our business customer friendly for individual who spoke languages other than English.