What drives language to be used is communication because humans need communication and interaction to go through our daily lives. We need language to do business, to learn, to spread propaganda etc.

For example, in terms of phonetics, when using the word utilise (British English) and utilize (American English), both semantically refers to the same meaning. As long as it refers to the same in its context, both should be acceptable. A certain word that is deemed acceptable in one place in terms of spelling may not be perceived the same way in another place. In an international context, what matters is how these two words that are spelt differently brings into one single comprehension. 

It is natural for a language to evolve and adapt within the society who uses the language. There is even language variation which differs in different regions in a place. What matters is the fact that society shares the same understanding of the words and sentence produced. According to Fedurek and Slocom (2011), language allows human to communicate abstract ideas verbally or nonverbally. Language adaptation happens to facilitate people in communicating better (Strongman, 2017). Thus, it is normal for one language to be diverse, especially when it is used by people with different cultures and background.

As an applied linguist, we should note that the variety of English in terms of language or dialect should be embraced with open arms. There is no such thing as one particular correct English. We truly believe that as long as the message can be delivered and perceived correctly among the users, the English has been used correctly.