The language is the most basic mean of understanding and collaboration between the people. If there's two or more groups of people that speak different languages, than automatically they will only communicate and collaborate with people that speak the same language, while avoiding the people that speak another language as they will not be able to understand each other.
This can be a very big reason for division between the people. This usually means that there will either be a country that is divided and functions with two or more confederate states, or more likely it will lead to separatist movements and creating two or more nations. The borders will most likely be set in accordance to the areas where certain language is spoken.
The north American city that’s not considered as one of the three largest city in the world could be Chicago
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12 miles away, on the Eastern side of the city, Anirudh Joshi
Nationalism<span> is generally used to describe either the attachment of a person to a particular nation, or a political action by such a group to achieve statehood.</span>