Two theories on how English became so widespread are: The Nomadic Warrior theory, stating that the Kurgans were first to domesticate horses, giving them an advantage when it came to conquests and war, so they were able to quickly and forcefully spread their language. The sedentary farmer theory is the latter one, stating that a group of people who spoke a certain language were one of the few to master the art of farming and moving, they could spread out slowly and bring their language with them.
The Norman and Germanic invasions influenced the Old English Language after the invasions. This caused Old English to borrow words from the Norman and Germanic languages when they encountered new things and experiences, and when conversing between the three groups. The borrowed words merged the two languages into a lingua franca.
British Imperialism influenced English as well. The spread of the British Empire diffused English to new areas of the Earth, causing them to merge with or adopt the new language.
Countries that had English and American colonizers were often forced to take up English as the main language, later influencing their official languages after colonization, one example is the Philippines, as many people there are choosing to learn English.
Once English became widespread and commonly used, it began being used in popular culture. This spread it even further with the rapid changes and diffusion of pop culture. International competitiveness is a factor of popular culture due to the fact that it holds such a large influence on countries and areas all around the world.
Now that English is one of the world’s most common languages, several countries are making it an official language. The country of Taiwan has recently decided to make English into one of the official languages. A consequence of this is that many indigenous languages are being suppressed and no longer taught.